| File extension Name |
extension description |
| .C | UNIX Compact File Achive |
| .C | ADS Source Code (Autodesk, Inc.) |
| .C | Desktop Color Separation Specification Cyan Layer |
| .C | Origin C Program File (OriginLab Corporation) |
| .C | Check Point Site Configuration for Secure Remote (Check Point Software Technologies Ltd.) |
| .C | C/C++ Program File |
| .C | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .C V | Cvip File |
| .C!_ | Audio Utility Midimach Compressed File |
| .C#= | C# (Microsoft Corporation) |
| .C++ | C++ Source Code |
| .C-- | Sphinx C-- Source |
| .C0 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .C00 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C00 | Ventura Print File |
| .C01 | Genesis 2000 (Genesis 2000, Inc.) |
| .C01 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C02 | (C02-C38) Driveimage Ace File |
| .C02 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C03 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C04 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C05 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C06 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C07 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C08 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C08 | Lord Of Destruction Game File |
| .C09 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C1 | Pov-ray for Windows v3.1 Scenes Advanced Newltpot File (Persistence of Vision Raytracer Pty Ltd.) |
| .C10 | IRIG 106 Original Recording File (Range Commanders Council) |
| .C10 | WinAce Compressed File Split Portion of Compressed File (e-merge GmbH) |
| .C13 | Charlie Packer |
| .C1S | Capture One Photo Cache File (Phase One) |
| .C2 | Pov-ray for Windows v3.1 Scenes Advanced Newltpot File (Persistence of Vision Raytracer Pty Ltd.) |
| .C2C | CopyToDVD Project File (VSO-Software) |
| .C2D | WinOnCD CD Image (Sonic Solutions) |
| .C2E | NJStar Chinese Word Processor Dictionary File Index (NJStar Software Corp.) |
| .C2I | Driver File |
| .C2I | Tt File |
| .C2L | Cequadrat WinonCD File |
| .C2X | WinonCD File |
| .C3 | 3D Model |
| .C3 | Pov-ray for Windows v3.1 Scenes Advanced Newltpot File (Persistence of Vision Raytracer Pty Ltd.) |
| .C39 | (C39-C56) Quicken Ace File |
| .C3D | Coordinate 3D |
| .C3D | Micrografx |
| .C3D | Cult3D Designer Intermediate File |
| .C3D | Chem3D Chemical File (CambridgeSoft Corporation) |
| .C3E | Cype |
| .C3T | Chem3D Chemical Template File |
| .C4 | Joint Engineering Data Management (JEDMICS) DoD Engineering Data Format |
| .C4 | Edmics |
| .C4 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .C4D | Clonk Object Definition (RedWolf Design GmbH) |
| .C4D | Cinema 4D 3D Model (MAXON Computer GmbH) |
| .C4F | Clonk Round File (RedWolf Design GmbH) |
| .C4G | Clonk System File (RedWolf Design GmbH) |
| .C4P | Clonk Player File (RedWolf Design GmbH) |
| .C4S | Clonk Scenario (RedWolf Design GmbH) |
| .C4V | Clonk Video (RedWolf Design GmbH) |
| .C6 | Ashlar-Vellum (Ashlar Incorporated) |
| .C64 | Commodore 64 Game ROM |
| .C86 | Computer Innovation C86 C Program |
| .C9 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CA | FlexPlus Data File (DATAIR Employee Benefit Systems, Inc.) |
| .CA | Telnet Server Initial Cache Data File |
| .CA | CLAN Conversion Analysis (Child Language Data Exchange System) |
| .CA0 | Installer Packed and Split File (Borland Software Corporation) |
| .CA1 | Delphi Install Disk11 File |
| .CA1 | STABCAL (stability calculation for aqueous systems) File |
| .CA1 | OzWin CompuServe E-mail/Forum Access Catalog File |
| .CA2 | STABCAL (stability calculation for aqueous systems) File |
| .CA2 | Delphi Install Disk12 File |
| .CA3 | Delphi Install Disk9 File |
| .CA4 | STABCAL (stability calculation for aqueous systems) File |
| .CA4 | Electronics Workbench Circuit |
| .CA4 | Delphi Install Disk10 File |
| .CA5 | Delphi Install Disk11 File |
| .CA7 | STABCAL (stability calculation for aqueous systems) File |
| .CA7 | Beta 44 Job File |
| .CAB | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAB | Cabinet File (Microsoft Corporation) |
| .CAB | Install Shield v5.x or 6.x Compressed File (InstallShield Software Corporation) |
| .CAC | Infoview (Microsoft Corporation) |
| .CAC | Collage Alarm Clock Alarm File (Collage Alarm Clock) |
| .CAC | dBASE IV Executable File |
| .CACHE | Snacc-1.3 VDA File |
| .CACHE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAD | QuickCAD CAD Drawing (Autodesk, Inc.) |
| .CAD | Inago Rage Compact Arena Definition (Dejobaan Games) |
| .CAD | CadStd Drawing (CadStd Computer) |
| .CAD | Softdesk Drafix CAD File |
| .CAD | EXTRACAD Drawing (Softwing Srl) |
| .CADET | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAE | Caditor Encrypted Document (Caglow) |
| .CAF | Southern Company Terrestrial Data Acq |
| .CAF | Class Action Gradebook Secondary/College Edition Data File (CalEd Software) |
| .CAF | GarageBand Apple Loop (Apple Inc.) |
| .CAG | CADfix ASCII Geometry File (ITI TranscenData) |
| .CAG | Capella Gallery Data File (Capella Software) |
| .CAG | Clip Gallery Catalog File (Microsoft Corporation) |
| .CAI | SeeYou Flight Data (Naviter) |
| .CAISSE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAJ | CAJViewer Full-text Database |
| .CAK | Sega FILM/CPK File Format (Sega of America, Inc.) |
| .CAKEWALKWINDOWLAYOUT | Cakewalk Window Layout (Cakewalk) |
| .CAL | CALS Raster |
| .CAL | Radiance Function File Format |
| .CAL | HTML Calendar Maker Pro |
| .CAL | DOS Calendar Creator File |
| .CAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAL | SuperCalc Worksheet |
| .CAL | Daqarta Extended Audio Data (Interstellar Research) |
| .CAL | CyberAudioLibrary Link |
| .CAL | Cakewalk Application Language Script (Cakewalk) |
| .CAL | Calendar File |
| .CAL | PhotoSmart 850 Digital Camera Firmware Update (Hewlett-Packard Development Company, L.P.) |
| .CAL | QV Map Geographic Coordinates (Touratech) |
| .CAL | Creatacard Calendar Project (Broderbund) |
| .CAL | Schedule Data (Microsoft Corporation) |
| .CALC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CALCULATOR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CALENDAR1994 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CALL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CALS | CALS Raster |
| .CAM | Calibrated Camera File Photomodeller |
| .CAM | Casio QV Digital Camera Image (Casio Computer Co., Ltd.) |
| .CAM | Minolta Scanner 3D File (Minolta) |
| .CAM | NASCAR Racing 2002 Replay Camera Settings (Sierra) |
| .CAM | Abe's Oddysee Background (Oddworld Inhabitants) |
| .CAM | HouseCall AUTOEXEC.BAT Backup (Trend Micro Inc.) |
| .CAM | Mill Data File (GraphiTech Ltd.) |
| .CAM | Camtasia Studio Project/Producer Files (TechSmith Corporation) |
| .CAMP | Windows Color System Color Appearance Model Profile (CAMP) (Microsoft Corporation) |
| .CAMPROJ | Camtasia Studio Project File (TechSmith Corporation) |
| .CAMREC | Camtasia Studio Recorder File (TechSmith Corporation) |
| .CAMS | Driver (Atari) |
| .CAMSHR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAMTHTR | Camtasia Studio Theater File (TechSmith Corporation) |
| .CAN | .Can Encryptor/Decryptor Encrypted File |
| .CAN | Canon Navigator Fax |
| .CAN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAP | Generic Network Capture Document |
| .CAP | Code Architect Project File (Embedded Systems Academy) |
| .CAP | Shomiti Surveyor Capture File |
| .CAP | Snoop Capture File |
| .CAP | Telix Session Capture |
| .CAP | TTC FireBerd 500 PC Capture File |
| .CAP | Ventura Caption |
| .CAP | WWG Domino Capture File |
| .CAP | WWG LinkView PRO Capture File |
| .CAP | ProComm/Telix session Capture File |
| .CAP | Sniffer Capture File (Network Associates Technology, Inc.) |
| .CAP | Fluke Protocol Inspector Capture File |
| .CAP | Capella Music Sheet Data File (Capella Software) |
| .CAP | Agilent LAN Analyzer Capture File |
| .CAP | PacketView Pro Packet Trace Data (Klos Technologies, Inc.) |
| .CAP | NetMon Capture File (Microsoft Corporation) |
| .CAPITAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAPROJ | ChartAble Project File (MRDC Ltd) |
| .CAPS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAPS | Visimetrics Digital CCTV Recording |
| .CAR | PSA Cards Address Book (PSA Software) |
| .CAR | Cellsprings/Web or DT Rule File (J.M.G. Elliott) |
| .CAR | CardMaker Ver. 1.0-2.0 Card File (Avery) |
| .CAR | SeeYou Airspace (Naviter) |
| .CAR | CAR Archive Compressed Archive (MylesHi! Software) |
| .CAR | Design-Your-CD Data File (Avery) |
| .CAR | Carnivores / Ice Age Resource File (Action Forms, Ltd.) |
| .CAR | AtHome Assistant |
| .CAR | Carrara Environment (DAZ Productions) |
| .CAR | Creatacard Quarter-Fold Card Project (Broderbund) |
| .CAR | Insight II Cartesian Coordinate File (Accelrys Software Inc.) |
| .CAR | SAPCAR Archive (SAPGenie.COM) |
| .CAR | NASCAR Racing 2002 Car Description File (Sierra Entertainment, Inc.) |
| .CAR | NeoBook Cartoon (NeoSoft Corp.) |
| .CAR | Viper Racing Car Description File |
| .CAR | Railroad Tycoon 3 Car Properties (PopTop Software Inc.) |
| .CARAMBA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CARD | Funkiball Adventure Auto-Saved Game File (RealNetworks Inc.) |
| .CARD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CARDS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAROL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAROLES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAS | Atari Cassette Image File (Atari) |
| .CAS | Quest Compiled Adventure Game (Axe Software) |
| .CAS | FLUENT Case (Fluent Incorporated) |
| .CAS | Cascade DTP Ver. 3 Layout File (Price Media) |
| .CAS | Casio Calculator Program (Casio Computer Co., Ltd.) |
| .CAS | Comma-delimited ASCII File |
| .CAS | i2's Case Notebook Timeline Analysis |
| .CAS | Videoton TVC Computer Tape File |
| .CAS4 | Cascade DTP Ver. 4 Layout File (Price Media) |
| .CASCII | CACTVS Chemical ASCII Format |
| .CASE | EnSight Results File (Computational Engineering International (CEI)) |
| .CASE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CASECONVERT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CASTLE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAT | TAPCIS Forum Library Catalog |
| .CAT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAT | TablEdit Chord Catalog |
| .cat | UNIX Configuration File |
| .CAT | Quicken IntelliCharge Categorization File (Intuit Inc.) |
| .CAT | PhotoStudio (ArcSoft, Inc.) |
| .CAT | OzWin CompuServe E-mail/Forum Access Catalog File |
| .CAT | dBASE Catalog |
| .CAT | Cognos Impromptu Database Report |
| .CAT | Rational Rose Logical Package (IBM) |
| .CAT | Security Catalog (Microsoft Corporation) |
| .cat | UNIX Message Catalog File |
| .CAT | Catz Cat Description File (Ubisoft Entertainment) |
| .CAT | Casio Calculator Program (Casio Computer Co., Ltd.) |
| .CAT | Advanced Disk Catalog Disk Catalog (Elcomsoft) |
| .CAT | Todd Osborne Directory Catalog |
| .CATALOG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CATEGORIES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAULDRON | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAVE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CAZ | Computer Associates Archive (CA) |
| .CA_ | Cakepro Compressed Audio File |
| .CB | Brief Macro Source Code |
| .CB | Crystal Button File |
| .CB | Clean Boot File (Microsoft Corporation) |
| .CB | Gigascape Virtual Town Project (Third Dimension Limited) |
| .CB | COMBAS Source Code (Living Byte Software GmbH) |
| .CB3 | CliBench Mk III SMP 0.7.10 |
| .CB4 | Analytics Cube (Actuate Corporation) |
| .CBC | CubiCalc Fuzzy Logic System File |
| .CBCP | CodeBaby Production Studio Character Package (CodeBaby Corp.) |
| .CBCX | Comic Book Creator Comic Book Save File Format (Planetwide Media) |
| .CBD | WordPerfect Dictionary File (Corel Corporation) |
| .CBD | System DLL Catroot File |
| .CBD | MapBrowser/MapWriter Vector Map Data |
| .CBF | Calendar Builder Saved Calendar (RKS Software) |
| .CBF | Infinity Game Engine Archive of Resources (BioWare Corp.) |
| .CBF | CoffeeCup Button Factory Button (CoffeeCup Software, Inc.) |
| .CBH | ChessBase Chess Database File |
| .CBI | IBM Mainframe Column Binary Formatted File |
| .CBIN | CACTVS Chemical Binary Format |
| .CBK | Kreon Scanner File |
| .CBK | Giza Specifier Drawing Backup File (20-20 Technologies) |
| .CBK | CardScan Backup File (Corex Technologies) |
| .CBK | System DLL Catroot File |
| .CBK | National Construction Estimator 32 Costbook |
| .CBL | CD Box Labeler Pro (Green Point Software UK Ltd.) |
| .CBL | Contextual Browsing Language Viewer |
| .CBL | RM/COBOL Development System Source File (Liant) |
| .CBL | PDP-10 COBOL Compiler Source |
| .CBL | COBOL Program |
| .CBLE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CBM | Fuzzy Bitmap |
| .CBM | XLib Compiled Bitmap |
| .CBMV | Comic Book Millennium Comic Book Collection (Beaver Valley Software Company) |
| .CBN | PaperMaster Cabinet (j2 Global Communications, Inc.) |
| .CBN | CBN Selector Smart Image (CBN Systems) |
| .CBO | COMBAS Object File / Compiled Program (Living Byte Software GmbH) |
| .CBO | Interactive Training Bookmark (Microsoft Corporation) |
| .CBP | CD Box Labeler Pro (Green Point Software UK Ltd.) |
| .CBP | Code::Blocks Project File (The Code::Blocks Team) |
| .CBP | CentraBuilder (CentraLearning International) |
| .CBP | Conlab Project (Apix Concrete Solutions) |
| .CBR | CDisplay RAR Archived Comic Book File |
| .CBS | Computer Based Training (Microsoft Corporation) |
| .CBS | MasterWord Button Bar Configuration |
| .CBS | Borland Computer Based Training (Borland Software Corporation) |
| .CBS | Cardbox Macro Script |
| .CBS | Calendar Builder Style Sheet (RKS Software) |
| .CBS | Code Breaker Save File (GSCCC, Inc.) |
| .CBT | Computer Based Training |
| .CBTX | Comic Book Creator Comic Book Page Template File (Planetwide Media) |
| .CBTZ | Comic Book Creator Comic Book Page Template Container File (Planetwide Media) |
| .CBU | Conlab Update Information (Apix Concrete Solutions) |
| .CBV | ChessBase Archive File (ChessBase GMBH) |
| .CBW | Cardbox Workspace |
| .CBX | Rational XDE (IBM) |
| .CBZ | CDisplay ZIP Archived Comic Book File |
| .CC | C++ Program File |
| .CC | CC Language Source Code |
| .CC | ADS Source Code (Autodesk, Inc.) |
| .CC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CC | Trojan Spymaster.A Text File |
| .CC | dB2K Custom Class File |
| .CC | Picture Window's Color Curve File |
| .CC | Visual dBASE Custom Class File |
| .CC | KODAK Color Control Profile (KODAK) |
| .CC1 | Briggs Softworks Calendar Commander |
| .CC1 | Chem3D Cartesian Coordinates 1 |
| .CC2 | Calendar Commander Calendar File (Briggs Softworks) |
| .CC2 | Chem3D Cartesian Coordinates 2 |
| .CC2 | ClubControl 2 |
| .CC3 | CUEcards Professional Database (Marcus Humann) |
| .CC5 | Calendar Creator 5.x 6.x File |
| .CCA | CC:Mail Archive File (IBM) |
| .CCA | Multimedia Fusion File (Clickteam) |
| .CCA | Common Component Architecture (CCA) Component (Dept. of Energy Laboratories) |
| .CCAD | ClarisCAD data |
| .CCB | Visual Basic Animated Button Configuration |
| .CCC | WordPerfect Office Calendar File (Corel Corporation) |
| .CCC | Internet Chat (Comic Chat) Conversation/Chatroom Log (Microsoft Corporation) |
| .CCC | FLEXnet Manager (Acresso Software Inc.) |
| .CCC | Curtain Call Native Bitmap Graphic |
| .CCD | CloneCD Control File (SlySoft Inc.) |
| .CCD | Vector CAD Program File |
| .CCD | IsoBuster Data Recovery File (Smart Projects) |
| .CCDOC | Rational CCDoctor Output (IBM) |
| .CCE | Calendar Creator 2 Event File |
| .CCF | Cumulus Database (Canto) |
| .CCF | CryptLoad Container File (CryptLoad) |
| .CCF | CommView Capture File (TamoSoft, Inc.) |
| .CCF | OS/2 Multimedia Viewer Configuration File |
| .CCF | Symphony Communications Configuration File |
| .CCF | Card Studio Card File Template (Hallmark) |
| .CCF | AudioReQuest Control File |
| .CCF | GPS Pathfinder Office Configuration File (Trinble Navigation Limited) |
| .CCF | Remote Control File |
| .CCF | Cannondale Motorcycle ECM System Engine Calibration File (Cannondale Corp.) |
| .CCH | Corel Chart |
| .CCH | .NET Configuration and Security Policy File (Microsoft Corporation) |
| .CCH | Forgotten Realms Unlimited Adventures (FRUA) Character Reference File |
| .CCH | Fabasoft Components |
| .CCH | PhotoModeler |
| .CCH | Photomodeler Photochip Thumbnail File (OES Systems) |
| .CCI | CCITT Group 3 and Group 4 Encoding |
| .CCITT | CCITT Group 3 and Group 4 Encoding |
| .CCJ | Crossword Compiler Compiled Crossword Applet (Antony Lewis) |
| .CCK | Corel Clipart Format (Corel) |
| .CCL | PDP-10 Concise Command Language (Used by COMPIL.EXE to Talk to Compilers) |
| .CCL | CCtools Levelset (Translucent Dragon) |
| .CCL | Intalk Communication Command Language |
| .CCM | CC:Mail Mailbox (IBM) |
| .CCM | Multimedia Fusion Custom Menu (Clickteam) |
| .CCN | Multimedia Fusion Express File (IMSI/Design LLC) |
| .CCN | Vitalize! Game File |
| .CCN | Calendar Constructer Calendar Data (Aspire Software) |
| .CCO | XBTX BTX Graphics File |
| .CCO | MicroSim PCBoard Autorouter Session Output |
| .CCO | CyberChat Data File |
| .CCO | Command Console Command File (DigitallyCreated) |
| .CCP | C Converter Profiles |
| .CCP | Two Brothers Software Encrypted File Information (Two Brothers Software) |
| .CCP | CalComp Color Palette File |
| .CCP | CloneCD (SlySoft Inc.) |
| .CCP | CaptureCAM-PRO Screen Recording (Click-N-Learn PTY LTD) |
| .CCPR | CaptureCAM-PRO (Click-N-Learn PTY LTD) |
| .CCR | Internet Chat Room Shortcut (Microsoft Corporation) |
| .CCR | Systems Management Server (SMS) Client Configuration Request (Microsoft Corporation) |
| .CCR | HealthFrame ASTM Continuity of Care Record (Records For Living, Inc.) |
| .CCRF | Calcomp Raster Bitmap |
| .CCS | CableNut Configuration Custom Setting File (CableNut Software) |
| .CCS | TrialDirector Clip Script (inData Corporation) |
| .CCS | CCS-lib File |
| .CCS | CONKY CeZaR Stribas International |
| .CCT | Railroad Tycoon 3 Car Type Description (PopTop Software Inc.) |
| .CCT | Windows Live Messenger Contacts File (Microsoft Corp.) |
| .CCT | DesignWorks Schematic File (Capilano Computing) |
| .CCT | LogicWorks Schematic File (Capilano Computing) |
| .CCT | MicroSim PCBoard Design Information and Rules For Autorouting |
| .CCT | SIL Hebrew Font System Transliteration Table |
| .CCT | Macromedia Director Shockwave Cast (Adobe Systems Incorporated) |
| .CCV | Crystal Vision Report (CTMS) |
| .CCX | Multimedia Fusion Extension (Clickteam) |
| .CCX | CorelDraw File |
| .CCX | Total Annihilation: Counter-Strike |
| .CCX | Corel Compressed Exchange File |
| .CCXML | Call Control eXtensible Markup Language (W3C) |
| .CCZ | Client-Course Manager Customized Report Distribution File (PTEP Inc) |
| .CC_ | Audio Utility Midimach Compressed File |
| .CD | Class Diagram (Unicode) |
| .CD | cdTree Content List |
| .CD | CD-i OptImage CD Image |
| .CD1 | Cafeteria Document System Data File (DATAIR Employee Benefit Systems, Inc.) |
| .CD150 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CD2 | Cafeteria Document System Custom Text File (DATAIR Employee Benefit Systems, Inc.) |
| .CD2 | Click'N Design 3D CD Label (Avery Dennison Corporation) |
| .CDA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CDA | Giza Specifier Typical File (20-20 Technologies) |
| .CDA | CD Audio Track Shortcut |
| .CDAT | Internet Security and Acceleration (ISA) Server Cache File (Microsoft Corporation) |
| .CDB | The Cleaner Trojan Database (Moosoft Development LLC.) |
| .CDB | CardScan Database (Corex Technologies) |
| .CDB | Turbo C Database (Borland Software Corporation) |
| .CDB | SymbianOS Contact Database File |
| .CDB | PowerDesigner Conceptual Model Backup File |
| .CDB | One Page from a ROM With a View Project File |
| .CDB | Nokia 9210/9290 Phone Contact Database (Nokia) |
| .CDB | Clipboard File |
| .CDB | Pocket Access Database (Microsoft Corporation) |
| .CDB | Giza Specifier Design File (20-20 Technologies) |
| .CDB | SeeYou Waypoint (Naviter) |
| .CDB | Mactive AdBase Data (Mactive AB) |
| .CDB | FreeOTFE Keyfile (Sarah Dean) |
| .CDBK | SPSS Database File |
| .CDC | CLAN Debug File (Child Language Data Exchange System) |
| .CDC | Canvastic Documnet/Drawing (Canvastic) |
| .CDC | Nero CD Cover File (Nero AG) |
| .CDC | Chromeleon Driver Configuration Plug-in |
| .CDD | Balder Multiboot Configuration File (Hans Christian Ihlen) |
| .CDD | Concept Draw Drawing/Diagram (Computer Systems Odessa, Corp.) |
| .CDD | Claris Draw v 1.2 Document |
| .CDD | Chromeleon Device Driver |
| .CDD | CADAM Drawing (Dassault Systemes) |
| .CDD | CD-Architect Driver File (Sonic Foundry) |
| .CDD | Cadifra Diagram (Cadifra Inc.) |
| .CDDA | AIFF Audio |
| .CDDS | Midtown Madness 3 Data |
| .CDE | Honeywell Hybrid Control Designer |
| .CDE | CADKEY Dynamic Extension (Kubotek USA Inc.) |
| .CDEV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CDEVSAMPLES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CDF | ANDI/netCDF Mass Spectrometry Data Interchange format |
| .CDF | Comma Delimited Format |
| .CDF | Channel Definition Format (Microsoft Corporation) |
| .CDF | Cyberspace Description Format |
| .CDF | InstallShield Components Definition File (Acresso Software Inc.) |
| .CDF | Xilinx Integrated Software Environment Chain Description File (Xilinx, Inc.) |
| .CDF | MicroSim PCBoard Component Description File For Bill Of Materials |
| .CDF | Unidata NetCDF Graphic File (University Corporation for Atmospheric Research) |
| .CDF | ASCII Format Describing VRML Worlds |
| .CDG | DART Karaoke Studio CD+G File |
| .CDG | CanoDraw Graph (Microcomputer Power) |
| .CDI | Phillips Compact Disk Interactive Format |
| .CDI | CD Anywhere Virtual CD (V Communications, Inc.) |
| .CDI | Disc Juggler CD Image File |
| .CDJ | Disc Juggler File |
| .CDK | OS/2 Saved SKF Format File (IBM) |
| .CDK | Calamus Document (invers Software) |
| .CDK | CD Katalog (KRISoftware) |
| .CDKEY | Protocol Used in Communicating from MediaRemote Server to PC MediaRemote Plug-in |
| .CDL | CaseWare Working Papers Document Link |
| .CDL | SignLab Vector Graphic |
| .CDL | CADKEY Advanced Design Language (CADL) (Kubotek USA Inc.) |
| .CDL | NetCDF CDL Metadata (Unidata) |
| .CDM | PowerDesigner Conceptual Model File |
| .CDM | Novell NetWare Disk Drivers NPA |
| .CDM | NTI CD&DVD-Maker Image File (NewTech Infosystems) |
| .CDM | Minolta Scanner 3D File (Minolta) |
| .CDM | Visual dBASE Custom Data Module |
| .CDM | Compressed Music Format |
| .CDMM | ConceptDraw MINDMAP Mind Map (Computer Systems Odessa Corporation) |
| .CDMP | Windows Color System Device Model Profile (DMP) (Microsoft Corporation) |
| .CDN | Click'N Design 3D CD Label (Avery Dennison Corporation) |
| .CDO | CADAM Overlay (Dassault Systemes) |
| .CDO | Cdo Navigator |
| .CDP | CD/Spectrum Pro |
| .CDP | Ca Visual Objects Platform for Developer (CAVO) (CA) |
| .CDPRJ | CD Menu Creator Project File (Drackon Tech) |
| .CDPX | ConceptDraw PROJECT Document (Computer Systems Odessa Corporation) |
| .CDPZ | ConceptDraw MINDMAP Document (Computer Systems Odessa Corporation) |
| .CDQ | CD Indexer |
| .CDR | Final Cut Pro CD/DVD Image File (Apple Inc.) |
| .CDR | Elite Plus Commander Saved Game |
| .CDR | Corel Vector Graphic Drawing (Corel Corporation) |
| .CDR | Sound File |
| .CDR | Raw Audio-CD Data |
| .CDR | GameJack Virtual CD or DVD Image (S.A.D. GmbH.) |
| .CDRZIP | DICOM Zipped Image Archive |
| .CDS | ChemDraw Stationery Document |
| .CDS | United States Postal Service Computerized Delivery Sequence |
| .CDS | Delphi TClientDataset Data (Borland Software Corporation) |
| .CDS | TrialDirector Input File (inData Corporation) |
| .CDSC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CDSG | DrawMusic Chord Song (Conrad Albrecht) |
| .CDT | MRS-802 Album Data (Zoom Corporation) |
| .CDT | STABCAL (stability calculation for aqueous systems) File |
| .CDT | CorelDraw Template (Corel) |
| .CDT | ProWORX Nxt Temporary Long Comment Data (Schneider Electric) |
| .CDT | ImgBurn CD-Text (LIGHTNING UK) |
| .CDU | CDU Paint |
| .CDV | CatDV Media Catalog (Square Box Systems Ltd.) |
| .CDV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CDW | KOMPAS Drawing (ASCON) |
| .CDW | CADKEY Organized Dialog File (CADKEY) |
| .CDW | CeledyDraw Drawing (Celedy Software Inc.) |
| .CDX | Alpha Five Table Index (Alpha Software, Inc.) |
| .CDX | NovaBACKUP Backup Database Index (NovaStor Corporation) |
| .CDX | iAnywhere Index File (Sybase, Inc.) |
| .CDX | Corel Draw Compressed Drawing |
| .CDX | Active Server Document |
| .CDX | ChemDraw Chemical Structure Exchange File (CambridgeSoft Corporation) |
| .CDX | Compound Index |
| .CDX | MicroStation Cell Library Index (Bentley Systems, Incorporated) |
| .CDX | Visual Foxpro Index (Microsoft Corporation) |
| .CDXL | Old Amiga Movie Format |
| .CDXML | ChemDraw XML ChemDraw Format |
| .CDZ | ROM With a View Project File |
| .CDZ | Cadenzo Music File (Heiko Hinz) |
| .CE | Computer Eyes, Digital Vision |
| .CE | FarSide Computer Calendar File |
| .CE | CA Clipper Workbench Application |
| .CE1 | Computer Eyes Raw Low Resolution Image |
| .CE2 | Computer Eyes Raw Medium Resolution Image |
| .CE3 | Calendar Creator 3.x 4.x Event List |
| .CEB | Apabi eBook |
| .CEC | Colombia en Cifras Financial Archive (Lunasoft Colombia Ltda.) |
| .CEF | CruzerLock Encrypted File (SanDisk Corporation) |
| .CEF | Class Action Gradebook Elementary Edition Data File (CalEd Software) |
| .CEF | Spaix PumpSelector Catalog Exchange Format (VSX - VOGEL SOFTWARE GMBH) |
| .CEF | CenturionMail Encrypted File (CenturionSoft) |
| .CEF | CA Clipper Workbench Application |
| .CEG | Continuous Edge Graphic Bitmap (Edsun) |
| .CEG | Tempra Show Bitmap Graphic |
| .CEI | CRiSP Harvest File |
| .CEL | KiSS Paper Doll File |
| .CEL | Celestia 3D Rendering Script |
| .CEL | MicroStation Cell Library (Bentley Systems, Incorporated) |
| .CEL | CIMFast Event Language File |
| .CEL | Animator Graphic (Autodesk, Inc.) |
| .CEL | Audition Loop File (Adobe Systems Incorporated) |
| .CEL | Lumena CEL Bitmap (Time Arts Software) |
| .CEL2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CELL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CELLAR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CELTIC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CELX | Celestia 3D Rendering Script |
| .CEM | Empire Earth Game File |
| .CEM | Computer Graphics Metafile |
| .CEN | Master Tracker Financial Analysis |
| .CEO | Extension associated with Winevar Worm |
| .CEP | CostOS Estimating Project Database File (Nomitech Unlimited) |
| .CER | Internet Security Certificate File |
| .CER | Cerius2 (Accelrys Software Inc.) |
| .CER | Sierra Print Artist Certificate |
| .CER | Creatacard Certificate Project (Broderbund) |
| .CER | MSI Cerius II Chemical Format File (Accelrys Software Inc.) |
| .CER | Lahey Fortran Compilation Error Messages |
| .CES | Sheffield Dictionary File |
| .CEV | Software License Tracking Tool |
| .CEV | LOUT Character Encoding File |
| .CEX | The Currency Exchanger Rate File |
| .CEX | CLAN Output File (Child Language Data Exchange System) |
| .CEX | INMOS Transputer Development System Occam User Program |
| .CEX | ThumbsPlus File |
| .CF | Sendmail Configuration File |
| .CF | CFwin Project Data (Procedimientos-Uno, S.L.) |
| .CF | Imake Configuration File |
| .CF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CF1 | Common File Format 1 |
| .CF2 | Common File Format 2 |
| .CF4 | Catfish File Manager Support File |
| .CFA | Premiere Pro Audio File (Adobe Systems Incorporated) |
| .CFB | Comptons Multimedia File |
| .CFB | Inmos Binary Configuration File |
| .CFC | Cold Fusion Component File (Adobe Systems Incorporated) |
| .CFD | CryptoForge Document (Ranquel Technologies) |
| .CFDG | Context Free Design Grammar |
| .CFE | CryptoForge Encrypted File (Ranquel Technologies) |
| .CFF | Common File Format |
| .CFF | Capabilities File for FOUNDATION Fieldbus H1 |
| .CFF | BoomTracker 4.0 |
| .CFG | Flight Simulator Aircraft Configuration File (Microsoft Corporation) |
| .CFG | Proxomitron Configuration File (Scott R. Lemmon (deceased)) |
| .CFG | Configuration |
| .CFG | Pro/ENGINEER Configuration (PTC) |
| .CFH | Capabilities File for FOUNDATION Fieldbus HSE |
| .CFI | CleverForm Script File (Code Development Ltd.) |
| .CFIG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CFK | Kardplay 1.62 File |
| .CFK | MS Developer Studio Diagram |
| .CFL | Developer Studio Diagram (Microsoft Corporation) |
| .CFL | Corel Flowchart File |
| .CFL | Compressed File Library File (Compressed File Container) |
| .CFM | Corel FontMaster |
| .CFM | Visual dBASE Windows Customer Form |
| .CFM | Cold Fusion Template File |
| .CFML | Cold Fusion Markup Language |
| .CFN | Calamus Font Data (invers Software) |
| .CFO | TCU Turbo C Utilities C Form Object |
| .CFO | Turbo C (Borland Software Corporation) |
| .CFP | QuickBooks Cash Flow Projector File (Intuit Inc.) |
| .CFP | Complete Fax Portable Fax File |
| .CFR | NRC Inspection Manual CFR Guidance |
| .CFR | IBM Configurator Report |
| .CFS | ChatFactory Script (ChatFactory Team) |
| .CFS | Signal Data (Cambridge Electronic Design Limited) |
| .CFS | Inmos Configuration File |
| .CFT | Animation Studio CFast Graphics File (Disney) |
| .CFT | Flow Chart; Corel Flow Template |
| .CFT | Cumberland Family Tree |
| .CFW | ChemFinder Form |
| .CFX | Flow-Cal File |
| .CFX | Creative DSP File |
| .CFX | Casio Algebra FX 2.0 Add-in (Casio Computer Co., Ltd.) |
| .CG | Chord Groover Guitar Song (Guitartab.co.uk) |
| .CG | Norton Crashguard File |
| .CG | Cg Toolkit Shader (NVIDIA Corporation) |
| .CG3 | Dungeons & Dragons Character File (Wizards of the Coast, Inc.) |
| .CG3 | Cabri 3D License File (CABRILOG SAS) |
| .CGA | CGA Resolution BMP Bitmap |
| .CGA | Color Graphics Adapter Graphics Data |
| .CGA | Ventura CGA Screen Characters |
| .CGB | Gameboy Color |
| .CGF | Asm Objasm |
| .CGF | ProWORX Nxt CODEGEN Batch File (Schneider Electric) |
| .CGF | Family Tree Creator Deluxe (Broderbund) |
| .CGF | Egrid32 Grid Format File (Elias Montoya) |
| .cgi | Common Gateway Interface Script |
| .CGL | CodeGuard Error Log |
| .CGM | Computer Graphics Metafile [New Style] |
| .CGM | Computer Graphics Metafile [Old Style] |
| .CGO | Railroad Tycoon 3 Car Properties (PopTop Software Inc.) |
| .CGP | DVDFab Change Graphic Picture (Fengtao Software Inc.) |
| .CGP | NetCaptor CaptorGroup (Stilesoft, Inc.) |
| .CGR | Quest3D Program Part (Act-3D B.V.) |
| .CGT | GOLD Parsing System Table (Devin Cook (and Contributors)) |
| .CH | Clipper Header |
| .CH | OS/2 Configuration File |
| .CH | String Data Storage (Encrypted) |
| .CH | String Data Storage |
| .CH1 | Freelance Graphics CHart (IBM) |
| .CH1 | ViewChoice (Payroll Associates, LLC) |
| .CH10 | IRIG 106 Original Recording File (Range Commanders Council) |
| .CH3 | Harvard Graphics Chart (Harvard Graphics) |
| .CH4 | Charisma 4.0 Presentation |
| .CHA | mIRC Chat File |
| .CHA | CLAN Frequency Sample File (Child Language Data Exchange System) |
| .CHA | PageMaker Kerning Data (Adobe Systems Incorporated) |
| .CHA | Challenger Encrypted File (it-com4) |
| .CHA | Character Data |
| .CHANG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHANGE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHANGELOG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHANGER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHANGES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHANGES | Squeak Change File |
| .CHAR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHAR1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHAR2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHAR3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHAR4 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHARSET | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHART | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHART2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHAT | PIRCH98 Chat File |
| .CHAT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHATLOG | Adium Chat Log (Adium Team) |
| .CHB | Oledb Checkbook File |
| .CHD | MAME Compressed Hard Disk File (MAME Team) |
| .CHD | Ares Font Chameleon Font Descriptor |
| .CHD | ChartFX File |
| .CHD | ViewChoice (Payroll Associates, LLC) |
| .CHE | CHwinEHE Control Data (Procedimientos-Uno, S.L.) |
| .CHEAT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHEAT | The Sims Custom Settings (Electronic Arts, Inc.) |
| .CHEATS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHECK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHECKER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHESSREV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHESSTITANSSAVE-MS | Chess Titans Saved Game File (Microsoft Corporation) |
| .CHF | pcAnywhere Remote Control File |
| .CHG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHG | Quicken On-line Data File (Intuit Inc.) |
| .CHGR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHH | C++ Header |
| .CHI | ChiWriter Document |
| .CHI | Help File Index (Microsoft Corporation) |
| .CHI | TOMBO Encrypted File (Tomohisa Hirami and TOMBO Maintainers) |
| .CHIME | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHIMES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHJ | Help Composer Project |
| .CHK | 3D Movie Maker Interface Data File (Microsoft Corporation) |
| .CHK | CHKDSK/SCANDISK Output |
| .CHK | SSConvert Multilanguage Video Subtitle Data (Screen Subtitling Systems Ltd.) |
| .CHK | Sophos Intercheck File |
| .CHK | Starcraft Campaign Map |
| .CHK | EpiData Check File (EpiData Association) |
| .CHK | WordPerfect Temporary File (Corel Corporation) |
| .CHKEXP | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHKJAIL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHL | Chile Compressed File |
| .CHL | Black and White 2 Game Data Script (Lionhead Studios) |
| .CHL | Internet Explorer Channel Information (Microsoft Corporation) |
| .CHL | RealPlayer Live Channel |
| .CHL | Configuration History Log |
| .CHL | Chromeleon Channel Raw Data |
| .CHM | Ares Font Chameleon Source Font - Font Outline |
| .CHM | HTML Help Compiled Help File (Microsoft Corporation) |
| .CHM | ChemDraw Chemical Structure (CambridgeSoft Corporation) |
| .CHN | Ethnograph Data File |
| .CHO | Animation:Master Choreography (Hash) |
| .CHO | Chord Pro Song Format (Mussoft) |
| .CHO | Ares Font Chameleon Output Font |
| .CHOICE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHOOCHOO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHOPIN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHOPPER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHOPRO | Chord Pro Song Format (Mussoft) |
| .CHOR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHORALE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHORD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHORDHARM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHORDPIANO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHORES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHORUS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHP | Ventura Publisher Chapter (Corel Corporation) |
| .CHP | DVD Chapter File |
| .CHP | CodeHealer Project File (SOCK Software, LLC) |
| .CHP | BizInt Smart Charts for Patents Document (BizInt Solutions) |
| .CHP | FLOWer (Pallas Athena) |
| .CHQ | Help Combined Full-text Search File (Microsoft Corporation) |
| .CHR | Character or Font File |
| .CHR | Infinity Game Engine Exported Character Info (BioWare Corp.) |
| .CHR | Borland Language Stroke Font File (Borland Software Corporation) |
| .CHR | Wormhole 2.0/ Liero Graphics Editor Liero Graphics Mod |
| .CHRISTMAS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHROMAFONT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHS | Corel WP Chart Style |
| .CHS | ChessRally Saved Game/E-mail Attached Game (Ingenuware, Ltd.) |
| .CHS | ATI Radeon Video Driver |
| .CHT | Chartist from Novagraph |
| .CHT | Navigator Vector Chart File (Tecepe) |
| .CHT | ZSNES Cheat Code (ZSNES Team) |
| .CHT | Novagraph Chartist File |
| .CHT | ICQ Saved Chat Session (ICQ Inc.) |
| .CHT | Harvard Graphics Vector File (Harvard Graphics) |
| .CHT | Sierra Generations Family Tree Chart (Sierra Entertainment, Inc.) |
| .CHT | Cheat Machine Data File |
| .CHT | ChartFX Template File |
| .CHT | SPSS Template (SPSS, Inc.) |
| .CHT | BizInt Smart Charts for Drug Pipelines Document (BizInt Solutions) |
| .CHT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHT | My Health Software Chart (My Health Software) |
| .CHT | ChartViewer dBASE Interface File |
| .CHU | Infinity Game Engine GUI Elements File (BioWare Corp.) |
| .CHURCH | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CHUZZLEDELUXESAVEDGAME | Chuzzle Deluxe Saved Game (PopCap Games, Inc.) |
| .CHW | HTML Help General Index Funtionally comparable to .GID. |
| .CHX | ZX-Editor Second Edition Big Font Files (OmikroN-Software) |
| .CHZ | ChArc Compressed File Archive |
| .CI | CitectSCADA File |
| .CI2 | Calin Lawyer's Interest Calculator Ver 2 Data File (Lawtech (Aust) Pty Ltd.) |
| .CI3 | Calin Lawyer's Interest Calculator Data File (Lawtech (Aust) Pty Ltd.) |
| .CIA | Sheffield Dictionary File |
| .CID | coDiagnostiX User Defined Implant (IVS Solutions AG) |
| .CID | Navigator Chart Image Description (Tecepe) |
| .CID | CallerID File (AnalogX) |
| .CIDA | xplorer?? Scrap File Document (Nikos Bozinis) |
| .CIDF | Creative ID Document File (Creative ID Software) |
| .CIF | Ventura Converted Image File |
| .CIF | Crystallographic Information File |
| .CIF | Chip Layout Information |
| .CIF | Ventura Chapter Information |
| .CIF | Easy CD Creator Image (Sonic Solutions) |
| .CIF | CalTech Intermediate Graphic |
| .CIF | Colombo Ipermedia File |
| .CIF | Ariba Buyer Catalog Information Format (Ariba Inc.) |
| .CIF | pcAnywhere Caller File |
| .CIF | Creator Document File (MultiAd, Inc.) |
| .CIG | Fastback Plus Compressed Backup |
| .CIK | Norton CleanSweep Installation Log (Symantec Corporation) |
| .CIK | Corel Graphics Ver. 10 Custom Dual Tone File (Corel) |
| .CIL | Clip Gallery Download Package (Microsoft Corporation) |
| .CIL | Norton CleanSweep Installation Log (Symantec Corporation) |
| .CIM | SimCity 2000 (Electronic Arts, Inc.) |
| .CIM | The Ultimate Draw C Text Mode Image File |
| .CIM | GE Industrial Systems CIMPLICITY HMI Screen |
| .CIM | CompuApps Drive Backup Image |
| .CIM | CIMEX Cimpack Design Drawing File |
| .CIN | Cineon Bitmap (Kodak) |
| .CIN | Digital Moving Picture Exchange Bitmap (The Society of Motion Picture and Television Engineers) |
| .CIN | Cinetitler Digital Screen Subtitling |
| .CIN | OS/2 Change Control File |
| .CIN | Quake II Cinematic Video (id Software) |
| .CIN | Photo-Sonics Picture Sequence |
| .CIN | Cinemania (Microsoft Corporation) |
| .CIN | Calculux Indoor Project (Royal Philips Electronics) |
| .CIN96LM | See .CIN |
| .CIN96UPD | See .CIN |
| .CIP | Ghost Keylogger File |
| .CIP | CryptoBuddy Encrypted File (Research Triangle Software) |
| .CIPO | Internet Same as .CPI. |
| .CIQ | CableIQ Test Data (Fluke Networks) |
| .CIR | real-PCB Netlist (Crocodile Clips Ltd) |
| .CIR | PSpice Circuit File (Cadence Design Systems, Inc.) |
| .CIR | SuperMax E-CAD Save-File Command |
| .CIRCLES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CIS | CheckInbox File |
| .CIS | TAPCIS Parameter/Address Book/Rates File |
| .CIT | SeeYou Vector Maps (Naviter) |
| .CIT | Norton CleanSweep Installation Log (Symantec Corporation) |
| .CIT | ClockIt Employee Duty Roster (ES-Software.net) |
| .CIT | Intergraph Scanned Image (Intergraph Corporation) |
| .CITY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CIV | Empire Earth Custom Civilization Information (Sierra Entertainment, Inc.) |
| .CIV4REPLAY | Civilization IV Replay File (Firaxis Games, Inc.) |
| .CIV4SAVEDGAME | Civilization IV Saved Game (Firaxis Games, Inc.) |
| .CIV4WORLDBUILDERSAVE | Civilization IV Saved World Builder Data (Firaxis Games, Inc.) |
| .CIX | Rational XDE (IBM) |
| .CIX | TCU Turbo C Utilities Database Index |
| .CJB | cleaner XL Job (discreet (an Autodesk Company)) |
| .CJP | WinOnCD Project File (Sonic Solutions) |
| .CK | ChucK Source Code (ChucK Team) |
| .CK1 | iD/Apogee Commander Keen 1 Data File |
| .CK2 | ViewChoice (Payroll Associates, LLC) |
| .CK2 | iD/Apogee Commander Keen 2 Data File |
| .CK2 | iD/Apogee Commander Keen 1 Data File |
| .CK3 | iD/Apogee Commander Keen 3 Data File |
| .CK3 | iD/Apogee Commander Keen 1 Data File |
| .CK4 | iD/Apogee Commander Keen 4 Data File |
| .CK4 | iD/Apogee Commander Keen 1 Data File |
| .CK5 | iD/Apogee Commander Keen 1 Data File |
| .CK5 | iD/Apogee Commander Keen 5 Data File |
| .CK6 | iD/Apogee Commander Keen 6 Data File |
| .CK6 | iD/Apogee Commander Keen 1 Data File |
| .CKA | Comfort Keys Database (Comfort Software Group) |
| .CKB | C++ Keyboard Mapping File (Borland Software Corporation) |
| .CKD | KeyCreator Design Container File (Kubotek USA Inc.) |
| .CKD | CADKEY Workshop Design File (Kubotek USA Inc.) |
| .CKF | Music Data Management Software Casio Keyboard File (Casio Computer Co., Ltd.) |
| .CKI | Off by One Browser Persistent HTTP Cookies (Off By One Productions, a division of Home Page Software Inc.) |
| .CKO | KnockOut 2 Image Mask (Corel) |
| .CKP | Valise Secure Archive (CertainKey, Inc.) |
| .CKP | Ingres Checkpoint File (Computer Associates International, Inc.) |
| .CKT | KeyCreator Design KeyCreator Template File (Kubotek USA Inc.) |
| .CKT | CircuitMaker Schematic (Altium Limited) |
| .CKT | B2 Spice Curcuit Design (Beige Bag Software, Inc.) |
| .CKT | Crocodile Clips |
| .CKV | CheckVision Database (CheckVision GmbH) |
| .CKX | ChucK Plug-in (ChucK Team) |
| .CL | Generic LISP Source Code |
| .CL | ArtIcons Pro Cursor Library (Aha-soft) |
| .CL | CLwin Project Data (Procedimientos-Uno, S.L.) |
| .CL3 | Easy CD Creator Layout File (Sonic Solutions) |
| .CL3 | Bruker Aspect NMR Data File |
| .CL4 | Easy CD Creator Ver 4 Layout File (Sonic Solutions) |
| .CL5 | Easy CD Creator Layout File (Project) (Sonic Solutions) |
| .CLA | CLASS336 Markup Language |
| .CLA | Java Class File (Sun) |
| .CLA | Clarion for DOS Source Code (SoftVelocity) |
| .CLAP | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLASS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLASS | Java Class File (Sun Microsystems, Inc.) |
| .CLASS | Java Bytecode (Sun Microsystems, Inc.) |
| .CLB | Total Club Manager Single Club Info (Electronic Arts Inc.) |
| .CLB | Corel Library |
| .CLB | COM+ Catalog File |
| .CLB | Office XP Developer Code Librarian (Microsoft Corporation) |
| .CLB | Super NoteTab ClipBook Template |
| .CLB | cdrLabel Compact Disc Label |
| .CLB | ICQ Contact List (ICQ Inc.) |
| .CLBX | MP3 Automagic CD Cover Creator (MACCC) Label (Brian Pipa and PipaSoft) |
| .CLC | Schedule+ 7-Habits Mission Statement (Microsoft Corporation) |
| .CLC | UltimaCalc Calculation Data File (UltimaCalc) |
| .CLC | Corel Catalog |
| .CLD | CD-Label Print Label Layout File (Canon, Inc.) |
| .CLD | CA Clipper Debugger Configuration File |
| .CLD | ClamWin AntiVirus Database (Clam AntiVirus Team) |
| .CLD | CD Label Designer Design File (Dataland Software) |
| .CLD | Clam AntiVirus Database (Clam AntiVirus Team) |
| .CLD | Skerryvore Software Simply Calenders |
| .CLD | Terragen Cloud Layer File (Planetside Software) |
| .CLDLYR | Terragen Cloud Layer File (Planetside Software) |
| .CLE | Icon Lock-iT Locked File Indicator (Moon Valley Software, Inc.) |
| .CLEAN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLEANER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLEAR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLEARANCE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLF | DesignWorks Symbol Library (Capilano Computing) |
| .CLF | ListPro Database (Ilium Software, Inc.) |
| .CLG | CollageMaker Graphic (Galleria Software) |
| .CLG | Disk Catalog Database |
| .CLG | Maxagrid CTM Log File |
| .CLI | Client Management System Customer File (HawkSoft, Inc.) |
| .CLICK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLIP | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLIP1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLIP2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLJ | Clojure Source Code (Rich Hickey, Open Source Project Sponsor) |
| .CLK | WatchGuard Cloaked File (WatchGuard Technologies, Inc.) |
| .CLK | R.A.V.E. Animation File (Corel) |
| .CLK | ClickFORMS Data (Bradford Technologies Inc.) |
| .CLKK | Clicker Keyboard (Crick Software Ltd.) |
| .CLKT | Clicker Template (Crick Software Ltd.) |
| .CLKW | Clicker Word Bank (Crick Software Ltd.) |
| .CLKX | Clicker Grid Set (Crick Software Ltd.) |
| .CLL | Clicker (Crick Software Ltd.) |
| .CLL | OzWin CompuServe E-mail/Forum Access Custom Library Search |
| .CLM | Micrografx Picture Publisher 7 Macro |
| .CLMOV | Clan Lord Movie - Visiostone (Delta Tao Software) |
| .CLN | Backup Configuration File |
| .CLO | SPSS Chart Look (SPSS, Inc.) |
| .CLO | Cloe Ray-Tracer |
| .CLOCK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLOE | Cloe Ray-Tracer |
| .CLOG | SpreadMaster Client Log (SpreadMaster.net) |
| .CLOSED | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLOUD | Homeworld Cloud Data (Sierra Entertainment, Inc.) |
| .CLOUD | GOM Atos Scanner File |
| .CLP | DeskMate Clip |
| .CLP | PC Paint/Pictor Picture |
| .CLP | Windows Clipboard/Picture |
| .CLP | Quattro Pro Clip Art (Corel) |
| .CLP | Clipper 5 Compiler Script |
| .CLP | GoDot |
| .CLP | CLIPS/wxCILPS File |
| .CLPI | Blu-ray Clip AV Stream File (Blu-ray Disc Association) |
| .CLR | Flash Color Table File (Adobe Systems Incorporated) |
| .CLR | WinMX Color Scheme (Frontcode Technologies) |
| .CLR | WinEdit Colorization Word List |
| .CLR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLR | PhotStyler Color Definition |
| .CLR | Boxer/2 Color Scheme |
| .CLR | 1st Reader Binary Color Screen Image |
| .CLR | FileMaker Spelling Dictionary |
| .CLR | Vue Color Maps (e-on software, inc.) |
| .cls | LaTeX Class Definitinon |
| .CLS | MS VB-4 Class Module Add-In |
| .CLS | ArcView Geocoding Classification File (ESRI) |
| .CLS | MS VisC++/Visual Basic Class Definition |
| .CLS | JavaScript Class |
| .CLS | C++ Class Definition |
| .CLS | Visual Basic Class Module |
| .CLT | VisualBoyAdvance Cheat List (Forgotten and VBA Team) |
| .CLU | IBM PCI Cryptographic Coprocessor Code File (IBM) |
| .CLU | Broken Sword 2 Dialog File (THQ Inc.) |
| .CLU | XNBC V8 Biological Neural Network Simulation Workstation Cluster Names |
| .CLU | Phantasmagoria 2 8-bit Playback Pallete File |
| .CLU | Clusse Node File (Heikki Hannikainen) |
| .CLU | CLUCalc Geometric Algebra Description (CLUScript File) (Christian Perwass) |
| .CLUB | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLUBS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CLV | Vbox Current Language File (Aladdin Knowledge Systems) |
| .CLV | Yamaha Cool Voices (Yamaha Corporation of America) |
| .CLV | Clovis for Outlook Schema Settings (Steelhead Systems) |
| .CLW | Clarion for Windows Source Code (SoftVelocity) |
| .CLW | Visual C++ Class Wizard File (Microsoft Corporation) |
| .CLX | Ceelox SecureMail Encrypted Document (Ceelox Inc.) |
| .CLX | Macro ToolsWorks Macro |
| .CLX | Acrobat (Adobe Systems Incorporated) |
| .CLX | Rational XDE (IBM) |
| .CLY | ACT! Layout (Best Software CRM Division) |
| .CLY | Corel Graphics Ver.10 Custom Layouts File (Corel) |
| .CL_ | C Poet compressed Disk1 File |
| .CM | Unix Puzzle 8-bit Bitmap |
| .CM | Craftman Data File |
| .CM1 | CaseMap Version 1.x Case Analysis File (LexisNexis) |
| .CM2 | CaseMap Version 2.x Case Analysis File (LexisNexis) |
| .CM2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CM2 | Curious Labs Poser Camera File |
| .CM3 | CaseMap Version 3.x Case Analysis File (LexisNexis) |
| .CM4 | ClipMate Data File |
| .CM4 | CaseMap Version 4.x Case Analysis File (LexisNexis) |
| .CM4 | Championship Manager 4 Saved Game (Sports Interactive Ltd.) |
| .CM5 | CaseMap Version 5.x Case Analysis File (LexisNexis) |
| .CM6 | CaseMap Version 6.x Case Analysis File (LexisNexis) |
| .CM7 | CaseMap Version 7.x Case Analysis File (LexisNexis) |
| .CMA | Filetopia Collection Manager List (Filetopia) |
| .CMA | Coach 6 Activities File (Foundation CMA - Centre for Microcomputer Applications) |
| .CMA | Camomile Library File |
| .CMA | Applix TM1 Database |
| .CMAP | CmapTools Concept Map (IHMC) |
| .CMAP | Hex Workshop Color Map File (BreakPoint Software, Inc.) |
| .CMB | Xtree for Windows Button Bar |
| .CMB | Reason Combinator Instrument Patch (Propellerhead Software) |
| .CMB | Chromeleon Backup Archive |
| .CMBL | Logger Pro Data (Vernier Software & Technology) |
| .CMBX | #develop (SharpDevelop) Combine File (IC#Code) |
| .CMC | PowerFront File |
| .CMC | Collectorz.com Comic Collector Collection Data (Collectorz.com) |
| .CMD | 1st Reader External Command Menu |
| .CMD | Summit Contact Manager Contact Database (MIE Software Pty Ltd) |
| .CMD | DOS CP/M Command File |
| .CMD | OS/2 |
| .CMD | PDP-10 Indirect Command File |
| .CMD | OS/2 REXX Batch File |
| .CMD | dBASE II Program File |
| .CMD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CMD | Command File for Windows NT (Microsoft Corporation) |
| .CMD5 | CrystalMaker Data (CrystalMaker Software Ltd.) |
| .CMDF | CrystalMaker Data (CrystalMaker Software Ltd.) |
| .CMDR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CME | Crazy Machines Level File (Pepper Games) |
| .CMF | Creative Music File |
| .CMF | Connection Manager Fixer File |
| .CMF | MapPoint 2006 Map File (Microsoft Corporation) |
| .CMF | CaseMap File Viewer Definition (LexisNexis) |
| .CMF | Corel Metafile |
| .CMF | CopyMate Data File (GraphiTech Ltd.) |
| .CMG | Chessmaster Saved Game (Ubisoft Entertainment) |
| .CMG | cramfs ROM Filesystem Package |
| .CMI | Camomile Interface File |
| .CMI | CD Mate CD Burning Image File (An Chen Computers Co. Ltd.) |
| .CMK | Card Shop Plus File |
| .CML | ProWORX Nxt Comment Data (Schneider Electric) |
| .CML | Crazy Machines Saved Laboratory File (Pepper Games) |
| .CML | PADGen Company Info File |
| .CML | Filetopia Collection Manager List (Filetopia) |
| .CML | Chemical Markup Language Document |
| .CML | Cheat Machine Library File |
| .CMM | CEnvi (ScriptEase:Desktop) Batch File |
| .CMMF | CrystalMaker Data (CrystalMaker Software Ltd.) |
| .CMMP | Camtasia Studio Menu Maker Project (TechSmith Corporation) |
| .CMMTPL | Camtasia Studio Menu Maker Template (TechSmith Corporation) |
| .CMN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CMN | Systems Management Server (SMS) Collection Membership Update (Microsoft Corporation) |
| .CMO | Spanish Whiz What Did You Say? Sound File (GB Blanchard) |
| .CMO | Virtools Behavioral Server Composition |
| .CMP | Giza Specifier Color Map (20-20 Technologies) |
| .CMP | Photofinish Calibration MaP |
| .CMP | PKWare Compression Library Compressed Data |
| .CMP | Route 66 Address Document |
| .CMP | HotDocs Template Component File (Matthew Bender & Company, a member of the LexisNexis Group) |
| .CMP | SWAT 3 Compressed Sound File |
| .CMP | Technics Keyboard Composer File |
| .CMP | Word for DOS User Dictionary (Microsoft Corporation) |
| .CMP | THEOS Compressed Archive (THEOS Software Corporation) |
| .CMP | Open Access File |
| .CMP | CaseMap Send To TimeMap Plug-in (LexisNexis) |
| .CMP | Chord Pro Song Format (Mussoft) |
| .CMP | CorelDRAW Postscript Printer Header |
| .CMP | CraftMan Data |
| .CMP | Address Document |
| .CMP | Discorp CMP Image |
| .CMP | Generic CADD Component File |
| .CMP | Internet Explorer Custom Menu Plug-in (Microsoft Corporation) |
| .CMP | JPEG Bitmap |
| .CMP | Leadview (LEAD) Bitmap |
| .CMP | Freelancer Physical Model Layout (Microsoft Corporation) |
| .CMPRB | CaseMap ReportBook Plug-in (LexisNexis) |
| .CMPROJ | Channel Master Project (SharpC Consulting Group) |
| .CMPT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CMQ | Culturemetrics |
| .CMR | CribMaster File |
| .CMR | SeeYou Raster Maps (Naviter) |
| .CMR | MediaPlayer Movie |
| .CMR | Coach 6 Saved Results File (Foundation CMA - Centre for Microcomputer Applications) |
| .CMRBK | CaseMap ReportBook Definition (LexisNexis) |
| .CMRT | CraftMan Data |
| .CMS | CaseMap Case Script (LexisNexis) |
| .CMS | TrialDirector Compound Media Storage |
| .CMS | TrialDirector Case File (inData Corporation) |
| .CMS | Coach 6 Project File (Foundation CMA - Centre for Microcomputer Applications) |
| .CMT | Culturemetrics |
| .CMT | e-Sword Commentary (Rick Meyers) |
| .CMT | Chinon ES-1000 Digital Camera |
| .CMT | Corel Draw |
| .CMTD | Cool Moon To Do To Do List (Cool Moon Software, LLC.) |
| .CMU | Carnegie Mellon Univeristy Stereo Raster Image |
| .CMU | CMU Window Manager Bitmap |
| .CMU | Andrew Toolkit CMU Format (Andrew Consortium) |
| .CMUWM | Carnegie Mellon University (CMU) Window Manager Bitmap |
| .CMV | CorelDRAW 4.0 Movie Animation (Corel Corporation) |
| .CMW | COM-Watch |
| .CMW | Custom Maintenance Wizard File (Microsoft Corporation) |
| .CMX | Qualcomm CMX Ringtone |
| .CMX | Apple Viewer (Apple Inc.) |
| .CMX | Presentation Exchange Image (Corel) |
| .CMX | Rational XDE (IBM) |
| .CMX | Patch File |
| .CMX | The Sims 3D Body Mesh Data (Electronic Arts (Maxis)) |
| .CMXA | Camomile Packed Library File |
| .CMY | Corel40 Custom File |
| .CMYK | Raw Cyan, Magenta, Yellow, and Black Samples |
| .CN | CNwin Project Data (Procedimientos-Uno, S.L.) |
| .CNB | Pegasus Mail Mail Message in Noticeboard (David Harris) |
| .CNC | CNC General Program Data |
| .CNC | Click 'n Create File (Clickteam) |
| .CNC3REPLAY | Command & Conquer 3 Replay (Westwood Studios) |
| .CND | ControlDraw File |
| .CND | Embroidery Design File |
| .CNDF | Compressed Channel Data File Contains data about satellite TV channels. |
| .CNF | minisat or ubcsat Connective Normal Form Logic Equations (SATLIB - The Satisfiability Library) |
| .CNF | 1-2-3 Configuration (IBM) |
| .CNF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CNF | KiSS Paper Doll Set |
| .CNF | Configuration File Used by Telnet, Windows, and other applications with varying internal formats. |
| .CNF | Inor MinIpaq Software File |
| .CNF | Windows SpeedDial (Microsoft Corporation) |
| .CNF | Conference Link |
| .CNM | Windows Application Menu Options and Setup File |
| .CNM | Pegasus Mail New Mail Message (David Harris) |
| .CNM | WinRoute Electronic Mail File (Kerio Technologies Inc.) |
| .CNM | NoteMap Outline File (LexisNexis) |
| .CNQ | Compuworks Design Shop File |
| .CNQ | WebShop Platinum Project File (Boomerang Software, Inc.) |
| .CNR | Click'N'Run Installation Package (Linspire,Inc.) |
| .CNR | CRiSP Harvest File |
| .CNR | Pegasus Mail Mail Message in Systemwide Folder (David Harris) |
| .CNREG | EULANDA Warenwirtschaft (ERP) Configuration Information |
| .CNREP | EULANDA ERP System Report Template |
| .CNS | Windows2000 Client Connection Manager Export File (Microsoft Corporation) |
| .CNT | Rational Rose 98 Contents Tab File (IBM) |
| .CNT | Help File Contents |
| .CNV | DB2 Conversion File |
| .CNV | WS_FTP Pro Upload Conversion File Data |
| .CNV | WordPerfect Temporary File (Corel Corporation) |
| .CNV | Word Data Conversion File (Microsoft Corporation) |
| .CNV | Canvas Versions 6, 7, 8, 9 Graphic File (ACD Systems Ltd.) |
| .CNX | Rational XDE (IBM) |
| .CN_ | Regeditx File |
| .CO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CO | Cult3D ActiveX Player Application (Cycore Systems AB) |
| .CO$ | MS Compressed COM Decompress with UNPACK.EXE. |
| .COA | Medlin Accounting Chart of Accounts With Beginning of Year Balances (Medlin Accounting) |
| .COA | TrueSpace 3D Object (Caligari Corporation) |
| .COB | Creatures Compiled Object File (Gameware Development Ltd.) |
| .COB | RM/COBOL Runtime System Application File (Liant) |
| .COB | COBOL Program File |
| .COB | TrueSpace Object (Caligari Corporation) |
| .COB | Total Annihilation Unit Script (Cavedog Entertainment) |
| .COB | TrueSpace2 Object |
| .COBRA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COCO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COD | C Compiler Output (Microsoft Corporation) |
| .COD | Video Text File |
| .COD | UUPC Code Definition Table |
| .COD | Boxer/2 printer Code Definition File |
| .COD | SWAT Input Control File |
| .COD | StatPac Gold Datafile |
| .COD | Multiplan Data File (Microsoft Corporation) |
| .COD | FORTRAN Compiled Code |
| .COD | Forecast Plus |
| .COD | dBASE Template Source File |
| .COD | dBASE Application Generator Template Source File |
| .COD | Compiler Program Code |
| .COD | Charset Code File |
| .COD | Code List |
| .COD | Blackberry Compiled Java Code (Research In Motion Limited) |
| .COD | Atlantis Word Processor Encrypted Document (Rising Sun Solutions, Inc.) |
| .COD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CODE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CODE | Graal and Related Servers Encrypted Cache (Cyberjoueurs) |
| .CODE0 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CODE1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CODE2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CODE3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CODE4 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CODEC | Rockbox CODEC (The Rockbox Crew) |
| .CODES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COF | Days Of Death Program/Media Saved Information (ColemanSystems) |
| .COK | Carmageddon Patch File |
| .COKE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COL | Multiplan Spreadsheet (Microsoft Corporation) |
| .COL | Movie Maker Collection File (Microsoft Corporation) |
| .COL | Internet Color Wizard Color Scheme |
| .COL | Autodesk Color Palette (Autodesk, Inc.) |
| .COL | MPEG Audio Collection Collection (The MAC Team) |
| .COL | HTML Help Collection File (Microsoft Corporation) |
| .COL | Grand Theft Auto III Collision Data (Rockstar Games) |
| .COL | SequoiaView Color Template (Technische Universiteit Eindhoven) |
| .COL | IFF Color Map Palette |
| .COL | Notes Import Column Description File (IBM) |
| .COL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COLA | Cola Source Code (The Perl Foundation) |
| .COLLAPSE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COLLECTION | Shareaza Collection (Shareaza Pty. Ltd.) |
| .COLLOQUYTRANSCRIPT | Colloquy Chat Transcript (Javelin.cc) |
| .COLOGNELA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COLOR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COLOR | Amaya Configuration |
| .COLOR2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COLORS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COM | EICAR Anti-Virus Test File (EICAR) |
| .COM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COM | Psion Organiser CommsLink Setup File (Psion PLC) |
| .COM | AOL (America Online, Inc.) |
| .COM | DOS or CP/M Executable |
| .COM | Command |
| .COM | Common Object Module |
| .COM2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMBAT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMFYCAKESSAVE-MS | Purble Place Saved Game (Microsoft Corporation) |
| .COMICSCARTOON | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMING | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMMANDLINE | Commandline Powertoy File |
| .COMMANDS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMMANDS2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMMENTS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMMON | MATLAB Install File (The MathWorks, Inc.) |
| .COMMS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMPACT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMPARE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMPARISON | Merge Comparison Report (Araxis Ltd.) |
| .COMPAT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMPAT | Likely a Text File |
| .COMPILERS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMPLICATIONS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMPOSER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMPPIANO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COMPRESSOR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CON | WordPerfect Document Concordance (Corel Corporation) |
| .CON | Unreal 2 Audio File (Epic Games, Inc.) |
| .CON | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CON | Concept Application Server Source Code (RadGs Software s.r.l) |
| .CON | Trace Data File (GraphiTech Ltd.) |
| .CON | Tree Professional Conifer Creator File |
| .CON | Train Simulator Train/Model Identification File (Microsoft Corporation) |
| .CON | Knowledgeware Consolidation File |
| .CON | LucasArts Container File (LucasArts Entertainment Company LLC) |
| .CON | Simdir Configuration File |
| .CON | Battlefield 1942 Configuration File (Electronic Arts, Inc.) |
| .CONCERTO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONF | Linux Configuration File |
| .CONF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONF | Palace Server Server Configuration (Communities.com) |
| .CONF | IRC Related Configuration File |
| .CONFERENCE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONFIDENT2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONFIDENTIAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONFIG | Rockbox Configuration File (The Rockbox Crew) |
| .config | UNIX Configuration File |
| .CONFIG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONFIG | NET Application Configuration Information (Microsoft Corporation) |
| .CONFIG | CRiSP Harvest File |
| .CONFIG | WatchDirectory Task Information (GdP Software) |
| .CONFIGDBLINK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONFIGS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONFIGURE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONNECTION | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONSEQUEN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONSOLE | WinNT Console File |
| .CONSOLE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONTACT | Windows Vista Contact File (Microsoft Corporation) |
| .CONTENTS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONTENTSONCLIPBOARD | Contents on Clipboard Powertoy File |
| .CONTROL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONTROL | Hydrologic Modeling System (HEC-HMS) Control Specifications Data (U.S. Army Corps of Engineers) |
| .CONTROLPANEL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONV | Stylus Studio Data Conversion Template (DataDirect Technologies, a division of Progress Software Corporation) |
| .CONVERSIONS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONVERT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONVERT2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CONVERTER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COO | Fabasoft Components |
| .COO | Cookie File |
| .COOKIES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COOL | QB - Text Analyzer Archive (Sierra Vista Software) |
| .COP | Tree Professional Conifer Creator Image File |
| .COPIER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COPIEREC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COPPER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COPY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COPYING | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COPYR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COR | WMOVIEC Input File |
| .COR | Protein Structure File |
| .COR | Insight II Output Coordinate File (Accelrys Software Inc.) |
| .COR | Web GPS Correction Server Export File |
| .COR | posem Correction File (Nimal Solutions Ltd.) |
| .COR | Cokriging Software COREG Output File |
| .CORE | Core Software Tech CORE IDC Bitmap |
| .CORELPROJECT | Photo Album Project (Corel Corporation) |
| .CORELSHOW | MediaOne Enhanced Slideshow File (Corel Corporation) |
| .CORRECT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CORRECTION | As-U-Type Correction FIle (Fanix Software) |
| .CORTOUCHKA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COS | Scarlett Expert System Compiler Query File |
| .COS | Creatures Object Source (Gameware Development Ltd.) |
| .COS3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COSMO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COSMO2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COSMO3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COSMO4 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COSMO5 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COSTS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .COT | Intergraph Raster Graphic (Intergraph Corporation) |
| .COUNT | Gen Counters File |
| .COUNTER | Netobjects Fusion Components Bbscomp Message File |
| .COV | Fax Cover Page (Microsoft Corporation) |
| .COX | Multimedia Fusion Plug-In (Clickteam) |
| .CP | Audition Script (Adobe Systems Incorporated) |
| .CP | CompuMedic Database |
| .CP | Sound Shared File |
| .CP1 | Compel Show Ver 1 Presentation (Click2learn, Inc.) |
| .CP2 | Compel Show Ver 2 Presentation (Click2learn, Inc.) |
| .CP8 | CP8 256 Gray Scale Image |
| .CP? | LoseThos C+ Source File (Terry A. Davis) |
| .CPA | Colasoft Capsa |
| .CPA | Cimrex Prog (Beijer Electronics) |
| .CPA | Compass program of the Takahashi |
| .CPA | Premiere Conformed Audio File (Adobe Systems Incorporated) |
| .CPAN | Tucows Info File (Tucows Inc.) |
| .CPAO | 3dize Cool Page Objects Counter File |
| .CPC | Cartesian Products Compressed Internet Document (Cartesian Products, Inc.) |
| .CPD | Fax Coversheet |
| .CPD | Complaints Desk Script |
| .CPD | Corel PrintOffice File |
| .CPE | Fax Cover Sheet (Microsoft Corporation) |
| .CPF | Complete PC Fax File |
| .CPF | O&O CleverCache Profile (O&O Software GmbH) |
| .CPF | CPF Editor Contract Preparation Form Submission File (CORDIS) |
| .CPF | CircuitCAM Manufacturing Process Definition File (Aegis Industrial Software Corporation) |
| .CPF | Canvastic Preferences (Canvastic) |
| .CPF | ProWORX Nxt Comment Pointer And Length File (Schneider Electric) |
| .CPF | CaseMap Portable Format (LexisNexis) |
| .CPG | 3dize Cool Page File Tutorial |
| .CPGZ | Compressed UNIX CPIO Archive |
| .CPH | Print House Image (Corel Corporation) |
| .CPI | AVCHD Clip Information |
| .CPI | Sietronics CPI XRD Document (Sietronics Pty Ltd) |
| .CPI | Calamus Graphic (invers Software) |
| .CPI | Windows International Code Page (Microsoft Corporate) |
| .CPI | Cartesian Products Compressed Internet Document (Cartesian Products, Inc.) |
| .CPI | ColorLab Processed Image |
| .CPICS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CPIO | UNIX CPIO Archive |
| .CPJ | Commotion File |
| .CPJ | CeQuadrant CD Project |
| .CPK | Sega FILM/CPK File Format (Sega of America, Inc.) |
| .CPL | Compel Show Ver 1 Presentation (Click2learn, Inc.) |
| .CPL | Corel Color Palette (Corel) |
| .CPL | Windows Control Panel Extension (Microsoft Corporation) |
| .CPL | TrialDirector Concordance File (inData Corporation) |
| .CPM | Cisco Secure Policy Manager File |
| .CPM | CP/M Executable |
| .CPM | InterComm Project Manager File |
| .CPM | ConceptHDL Project File |
| .CPM | Turbo Pascal DOS File (Borland Software Corporation) |
| .CPN | Age of Empires I and II Campaign File (Microsoft Corporation) |
| .CPN | Rise of Nations Campaign File (Microsoft Corporation) |
| .CPN | CPN Tools CPN Model File (CPN Group at the University of Aarhus) |
| .CPO | Corel Print House File |
| .CPP | C++ Builder 6 (Borland Software Corporation) |
| .CPP | Visual C++ Source Code File (Microsoft Corporation) |
| .CPP | CA-Cricket Presents Presentation |
| .CPP | Maya OpenGL 3D Scene (Alias Systems, a division of Silicon Graphics Limited) |
| .CPP | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CPP | Xcode Core C Program (Apple Inc.) |
| .CPQ | Exam Essentials Exam File (Cyber Pass Inc.) |
| .CPR | Corel Presents Presentation |
| .CPR | INMOS Transputer Development System Occam Program Code Fold |
| .CPR | ConTEXT Project File (Eden Kirin) |
| .CPR | Knowledge Access Graphics |
| .CPR | Cubase Project File (Steinberg) |
| .CPR | Port Royale |
| .CPR | CPC Plus Cartridge Image |
| .CPR | PV-WAVE Compiled Procedure File |
| .CPR | Patrician II |
| .CPS | Photo House Image (Corel Corporation) |
| .CPS | QEMM Backup of Startup Files |
| .CPS | Colored PostScript File |
| .CPS | Classroom Performance System File |
| .CPS | Anti-Virus Checksum |
| .CPS | Central Point PC Tools Backup |
| .CPT | After Shot (Corel Corporation) |
| .CPT | CA Cricket Presents Template |
| .CPT | Corel Photo-Paint Image (Corel) |
| .CPT | CCRYPT Encrypted File |
| .CPT | Compact Pro Archive (Cyclos) |
| .CPT | dBASE Encrypted Memo |
| .CPT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CPT6 | Corel Photo-Paint Image |
| .CPTHEME | cPanel Theme Package (cPanel, Inc.) |
| .CPU | Sysoft Sandra File |
| .CPX | Rise of Nations Campaign File (Microsoft Corporation) |
| .CPX | Age of Empires I and II Campaign File (Microsoft Corporation) |
| .CPX | Code Page Translation File (Microsoft Corporation) |
| .CPX | Control Panel Applet |
| .CPX | CryptaPix Encrypted Image |
| .CPX | Corel Presentation Exchange Compressed Drawing |
| .CPY | RM/COBOL Development System Include File (Liant) |
| .CPY | Cobol Include |
| .CPY | eCopy Scanned Document (eCopy, Inc.) |
| .CPY | Copy Books Data File |
| .CPY | Flexus COBOL Definitions |
| .CPY | Atari Ramdrive CPY Commands |
| .CPZ | COMPOZ Music Text |
| .CPZ | LoseThos C+ Source File (Terry A. Davis) |
| .CPZ | CP Shrink Archive (Symantec Corporation) |
| .CQ | CP/M SYSGEN Replacement |
| .CQL | XDCC Catcher Saved Queue List (SiHiDa and balduz (Developers)) |
| .CQQ | Cool Quiz |
| .CQS | CADfix Quality Standard (ITI TranscenData) |
| .CQZ | Cool Quiz |
| .CR | Iris Printer CT Format Bitmap |
| .CR | CRiSP Source Code |
| .CR | Crack File |
| .CR$ | BASIC VB Kartei File |
| .CR2 | Curious Labs Poser Character File |
| .CR2 | Canon Digital Camera Raw Image Format (Canon, Inc.) |
| .CR4 | STABCAL (stability calculation for aqueous systems) File |
| .CR5 | Tripod Data Systmes Survey Pro Coordinate File |
| .CR7 | STABCAL (stability calculation for aqueous systems) File |
| .CRA | Personal Craft Factory File |
| .CRA | Advanced Crack File (usually text) |
| .CRACK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRACKING | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRACKPOTY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRACKZBYMAB | YaHoE File |
| .CRAM | Compressed ROM File System File |
| .CRASH | OS X Crash Reporter Crash Report (Apple Inc.) |
| .CRASH2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRATE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRAW | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRAZE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRAZY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRB | BigOven Recipe Database (Lakefront Software, Inc.) |
| .CRC | Pro/ENGINEER Temporary File (PTC) |
| .CRC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRC | Total Commander CRC File (Christian Ghisler, C. Ghisler & Co.) |
| .CRC | JPEG Sheriff CRC Info File (engineering bureau Office Automation) |
| .CRC16 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRD | ColdRED Script File |
| .CRD | Guitar Chord File |
| .CRD | Windows Cardfile |
| .CRD | Spanish Whiz Card Game Sound File (GB Blanchard) |
| .CRDEL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRE | LiveUpdate Crescendo Catapult File |
| .CRE | Infinity Game Engine Monster Description (BioWare Corp.) |
| .CREATOR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CREDITS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CREG | CrazayReg Database (Crazy-Team) |
| .CRF | Zortech C++ Cross-Reference File |
| .CRF | OM2Cipher Recipient File |
| .CRF | Programming Cross-reference |
| .CRF | Sierra Print Artist Craft |
| .CRF | Thief 2: The Metal Age Archive |
| .CRF | Thief: The Dark Project Archive |
| .CRF | System Shock 2 Archive |
| .CRF | CHARTrunner Chart Definition (PQ Systems) |
| .CRF | MASM Cross-Reference File |
| .CRF | Database Cross-Reference File |
| .CRF | Calcomp Raster Bitmap |
| .CRG | Calamus Graphic (invers Software) |
| .CRH | Golf Image File (Microsoft Corporation) |
| .CRH | Links Games Course File |
| .CRH | EBwin Estudio Basico de Seguridad y Salud Health and Safety Project Information (Procedimientos-Uno, S.L.) |
| .CRK | Crack File |
| .CRL | Certificate Revocation List |
| .CRLD | Clicker Crick Resource Library Data File (Crick Software Ltd.) |
| .CRM | Capital Research Vendor Bid System |
| .CRM | Netmino File |
| .CRM | CHARTrunner Multi-Chart Definition (PQ Systems) |
| .CRO | Webalizer.01 Lang File |
| .CRONTAB | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CROPS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CROSS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CROWN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRP | dBASE Encrypted Database |
| .CRP | Visual dBASE Custom Report |
| .CRP | MSI SecureDoc Encrypted File (Micro-Star Int'l Co.,Ltd.) |
| .CRP | Corel Presents Run-Time Presentation |
| .CRS | StepMania Course (StepMania Development Team) |
| .CRS | WordPerfect 5.1 for Windows File Conversion Resource (Corel Corporation) |
| .CRS | Dance With Intensity |
| .CRS | Gold Game Course File |
| .CRS | Links Games Course File |
| .CRT | GlobalSign Certificate File |
| .CRT | Oracle Terminal Settings Info |
| .CRT | UNIX Crontab File |
| .CRT | Soft Concert Karaoke File |
| .CRT | C64 Cartridge Image |
| .CRT | X.509v3 Security Certificate |
| .CRU | CRUSH Compressed Archive |
| .CRUNCH | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRUNCHER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRV | Daqarta Extended Audio Data (Interstellar Research) |
| .CRV | Corel Graphics Ver. 10 Custom Gradients File (Corel) |
| .CRW | Cadrail Train Terrain Layout (Sandia Software) |
| .CRW | CHARTrunner Workspace Definition (PQ Systems) |
| .CRW | Canon Digital Camera Raw Image Format (Canon, Inc.) |
| .CRW | Crossword Genius |
| .CRX | Google Chrome Plugin/Extension File (Google) |
| .CRX | Links Games Course File |
| .CRY | CryEngine Sandbox Editor 2 Level Information File (CRYTEK) |
| .CRY | Cypherix/Cryptainer Encrypted Volume File Format (Cypherix) |
| .CRY | Crypto Chat II Encrypted Notebook-content |
| .CRYPTOMITE | CryptoMite Encrypted Archive (BAxBEx Software) |
| .CRYPTX | Cryptx Encrypted File ((CSI) Centro Studi Informatica di Danilo Priore) |
| .CRYSTALHAMMERREMIX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CRZ | FScruiser Cruise Record (USDA Forest Service) |
| .CRZ | Links Games Course File |
| .CS | Torque Game Engine Script (GarageGames) |
| .CS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CS | Visual C#.NET Source Code (Microsoft Corporation) |
| .CS | Tribes 2 Scripting File (Sierra) |
| .CS | Caditor Document (Caglow) |
| .CS | CLEO 3 Custom Script (Seemann) |
| .CS | Fractal Lab Data/Parameter File (Mystic Fractal) |
| .CS-CNF | Currency Server Software Configuration (Cloanto Corporation) |
| .CS1 | CaptureShop 1-Shot Image (Sinar) |
| .CS3 | Casio WK-1800 Keyboard Output File (Casio Computer Co., Ltd.) |
| .CS4 | CaptureShop 4-Shot Image (Sinar) |
| .CSA | Comma Deliminated Text |
| .CSA | Ultimate Ride Roller Coaster |
| .CSA | InterComm ASCII Sheet File |
| .CSB | Corel Photo-Paint Script (Corel) |
| .CSB | Pci Ncr3030 Ncrflash File |
| .CSB | CircuitSoft Viewer |
| .CSC | Wizard |
| .CSC | Corel Script (Corel) |
| .CSC | CrystalControl LCD Control Software Screen (Crystalfontz) |
| .CSD | Csound Unified File Format for Orchestras and Scores (Dr. Richard Boulanger) |
| .CSD | EasyLink Measurement Database (Damalini AB) |
| .CSD | Embroidery Design File |
| .CSD | Chemsoft MSDS Database File |
| .CSD | Bitstream Fontware |
| .CSD | Canon Camera Configuration File (Canon, Inc.) |
| .CSD | CHI-LLC Storage Designer Design (Computer Human Interaction, LLC) |
| .CSE | GPS Pathfinder Office Coordinate System (Trinble Navigation Limited) |
| .CSE | Cardinal Studio Template File |
| .CSF | Photoshop Color Settings (Adobe Systems Incorporated) |
| .CSF | [Unknown] |
| .CSF | Brava Reader Content Sealed Format (Informative Graphics Corp) |
| .CSF | Acrobat Color Setting (Adobe Systems Incorporated) |
| .CSF | Van Dyke's CRT/SecureCRT Script File |
| .CSF | GeoMedia Coordinate System File |
| .CSF | Uefa Champions League Logis Cutscene File |
| .CSFDB | Open CASCADE 3D Model File (Open CASCADE Company) |
| .CSG | Statistica Graph File |
| .CSH | Photoshop Custom Shape (Adobe Systems Incorporated) |
| .CSH | csh Script |
| .CSH | UNIX csh Shell Script |
| .CSH | CARA-Script-Interpreter-Engine Script |
| .CSH | Hamilton Labs C Shell Script File |
| .CSH | Cubase Offline Processing Information (Steinberg Media Technologies GmbH.) |
| .CSHRC | UNIX C Shell Environment File |
| .CSI | Cyberautograph Signed Item |
| .CSK | Claris Works |
| .CSK | StoryWeaver Template (Storymind Store) |
| .CSK | Copernic 2001 Skin (Copernic) |
| .CSL | AOL Modem Script (America Online, Inc.) |
| .CSL | Designer Symbol Library (Corel) |
| .CSL | Citation Style Language |
| .CSL | TestQuest Pro Test Script (TestQuest, Inc.) |
| .CSLM | Zeiss CSLM Bitmap |
| .CSM | C++ Symbol File (Borland Software Corporation) |
| .CSM | C++ Ver. 4.5 Precompiled Header (Borland Software Corporation) |
| .CSM | Kodak DC265 Camera Script |
| .CSM | CASL Compiled PalmPilot Program (Feras Information Technologies) |
| .CSM | COOLSoft Model Database (Wright Williams & Kelly, Inc.) |
| .CSM | Chemical Style Markup Language |
| .CSML | Chemical Style Markup Language |
| .CSN | CopyMate Raw Points Cloud (GraphiTech Ltd.) |
| .CSN | Dreamweaver MX's Snippet |
| .CSO | CISO Compressed ISO CD Image |
| .CSP | CASLwin Program (Feras Information Technologies) |
| .CSP | PC Emcee On-Screen Image |
| .CSP | AudioZip Encoded Audio |
| .CSP | Draw Service Bureau Profiler (Corel) |
| .CSP | Cardinal Studio Project File |
| .CSP | ChaoSynth Parameter File (Nyrsound) |
| .CSP | Crystal Enterprise Crystal Server Page |
| .CSP | CaseWare Working Papers Script Page |
| .CSPROJ | Visual Studio .NET C# Project (Microsoft Corporation) |
| .CSQ | Foxpro Query (Microsoft Corporation) |
| .CSR | Fast SMS Set SMS Relay Configuration (Comat AG) |
| .CSS | InterComm Part Body Definition |
| .CSS | Citadel SafStor User Script File |
| .CSS | Hypertext Cascading Style Sheet |
| .CSS | Statistica Datasheet |
| .CSS | Stats+ Datafile |
| .CSS1 | Cascading Style Sheet See .CSS. |
| .CST | Macromedia Director Cast File |
| .CST | Technics Sx KN 6000 Keyboard Custom Style File |
| .CST | CHARTrunner Chart Style Definition (PQ Systems) |
| .CST | Medbasin Model Calibration File (National Technical University of Athens, Laboratory of Reclamation Works & Water Resources Management) |
| .CSV | Comma-Separated Variables |
| .CSV | CompuShow Adjusted EGA/VGA Palette |
| .CSV | Boso View Express Railway and Structure File (Mackoy) |
| .CSVENX | egis Encrypted CSV File (HiTRUST Inc.) |
| .CSW | WordPerfect Setup Info File (Corel Corporation) |
| .CSW | Compressed Square Wave |
| .CSX | Visual C#.NET Primary Script File (Microsoft Corporation) |
| .CSY | EPOC Polymorphic DLL |
| .CS_ | Creativ Compressed Sb16 Sbide File |
| .CT | Continuout Tone TIFF Bitmap |
| .CT | Cheat Engine Cheat Table (Dream.media) |
| .CT | Iris CT Graphic |
| .CT | CTwin Project Data (Procedimientos-Uno, S.L.) |
| .CT | Scitex CT Handshake Continuous-Tone Bitmap |
| .CT0 | Systems Management Server (SMS) Master Site Control File (Microsoft Corporation) |
| .CT0 | Maxagrid CTM File Being Processed |
| .CT1 | Systems Management Server (SMS) Proposed Site Control File (Microsoft Corporation) |
| .CT1 | Maxagrid CTM File Successfully Processed |
| .CT2 | Maxagrid CTM File Unsuccessfully Processed |
| .CT2 | CTRAN/W Graphical Layout File (Geo-Slope International) |
| .CT3 | Systems Management Server (SMS) Proposed Site Control File (Microsoft Corporation) |
| .CT3 | CTRAN/W Sketch Lines and Text File (Geo-Slope International) |
| .CT3 | CaseMap Version 3.x Case Analysis Template File (LexisNexis) |
| .CT4 | CaseMap Version 4.x Case Analysis Template File (LexisNexis) |
| .CT5 | CaseMap Version 5.x Case Analysis Template File (LexisNexis) |
| .CT6 | CaseMap Version 6.x Case Analysis Template File (LexisNexis) |
| .CT7 | CaseMap Version 7.x Case Analysis Template File (LexisNexis) |
| .CTAB | CACTVS Chemical Table Format |
| .CTB | AutoCAD Color-dependent Plot Style Table (Autodesk, Inc.) |
| .CTB | Custody Toolbox Data File (Five O'clock Software) |
| .CTB | NoteTab Clipbar |
| .CTC | SeeYou Flight Data (Naviter) |
| .CTC | PC Installer Control |
| .CTD | Cobra Track Dump |
| .CTD | Click to DVD Project (Sony Corporation of America) |
| .CTD | Cardtable File |
| .CTD | Simpsons Cartoon Studio Export File |
| .CTD | Marine Data File |
| .CTE | Classical Text Editor Document (Stefan Hagel, Vienna) |
| .CTF | WhereIsIt Catalog |
| .CTF | BrightStor ARCserve Backup Backup File (Computer Associates International, Inc.) |
| .CTF | AVG Update Control File (AVG Technologies) |
| .CTF | CoffeeCup HTML Editor Table File (CoffeeCup Software, Inc.) |
| .CTF | Casio Text File (Casio Computer Co., Ltd.) |
| .CTF | PhotoSuite Album File (Sonic Solutions) |
| .CTF | Symphony Character Code Translation (IBM) |
| .CTF | TIFF Compressed File |
| .CTF | Calculator Text Format |
| .CTF | HP-95LX Character Translation File for Datacomm |
| .CTFSYS | OS X Mach Kernel System File (Apple Inc.) |
| .CTG | BMC Software Patrol File |
| .CTG | Powershot Pro 70 Info File (Canon, Inc.) |
| .CTG | Cartridge Definition File |
| .CTG | ChessBase Opening Book |
| .CTI | Collectorz.com Template Info File (Bitz & Pixelz) |
| .CTK | mSuite License File (CommonTime Limited) |
| .CTL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CTL | PDP-10 Batch Control File |
| .CTL | User Control |
| .CTL | EditPlus Cliptext File (ES-Computing) |
| .CTL | Setup Information |
| .CTL | Visual Basic User-defined Control (Microsoft Corporation) |
| .CTL | Notes 5 Thesaurus (IBM) |
| .CTM | CGMetafile |
| .CTM | OpenCTM Compressed Triangle Mesh File (Marcus Geelnard) |
| .CTM | SDR99 Speech Recognition Task Time Marked Conversation Input |
| .CTM | Content Delivery Service |
| .CTM | Maxagrid CTM File |
| .CTM | Java Charge Transaction Matrix File |
| .CTM | Crazytalk Talking Animation File |
| .CTM | FreeBSD Content Management File |
| .CTM | Crazy Talk Face Model File (Reallusion Inc.) |
| .CTN | CADTERNS Sloper File (CADTERNS Custom Clothing Inc.) |
| .CTP | BestAddress HTML Editor Combined Template File (Multimedia Australia Pty. Ltd.) |
| .CTP | ChemDraw Template |
| .CTP | American Greetings CreataCard (Broderbund) |
| .CTR | The Cookie Counter! Hit Count File (CLIQ Services Coop) |
| .CTR | ERGO Receiver Configuration File (Creative Express Corporation) |
| .CTR | Corel40 Trace File |
| .CTR | CTRAN/W DEFINE Data File (Geo-Slope International) |
| .CTR | Counter File |
| .CTR | CATALYST Text Parsing Rules File (Alchemy Software Development Ltd.) |
| .CTRL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CTS | ABC Programming Language Permanent Location Contents |
| .CTS | ClipTrakker Clipboard Collection (SoftwareOnline) |
| .CTS | Crazy Talk Audio File (Reallusion Inc.) |
| .CTT | LabVIEW File |
| .CTT | MSN Messenger Saved Contact List (MSN) |
| .CTT | CAIL Suite Terminal Emulation Data (CAIL Systems Inc.) |
| .CTV | Citavi Project (Academic Software Zurich GmbH) |
| .CTW | Context Tree Weighting Compressed File (Eindhoven University of Technology) |
| .CTX | Pretty Good Privacy (PGP) Ciphertext File (PGP Corporation) |
| .CTX | Online Course Text (Microsoft Corporation) |
| .CTX | Nokia PC Suite Backup Contact File (Nokia) |
| .CTX | GE Industrial Systems CIMPLICITY Text Version HMI Screen |
| .CTX | CTRAN/W DEFINE Compressed Data File (Geo-Slope International) |
| .CTX | Alphacam Compiled Text (Planit) |
| .CTX | Compressed Text |
| .CTX | Chinese Character Input File |
| .CTX | Visual Basic User Control Binary File |
| .CTX | Windows Terminal Server INI Backup File (Microsoft Corporation) |
| .CTX | Gasteiger Group CTX Chemical File |
| .CTY | Railroad Tycoon 3 Cargo (PopTop Software Inc.) |
| .CTY | Fog Creek CityDesk Template |
| .CTY | SimCity City File (Electronic Arts, Inc.) |
| .CTZ | Custody Toolbox Compressed Backup File (Five O'clock Software) |
| .CU1 | Photoline4 Curves Curve File |
| .CU3 | Photoline4 Curves Clut File |
| .CUB | SeeYou Airspace (Naviter) |
| .CUB | OLAP Cube File (Microsoft Corporation) |
| .CUB | PowerPlay File (Cognos Incorporated) |
| .CUB | MDL Molfile Gaussian Cube (Wavefunction) Format (MDL Information Systems, Inc.) |
| .CUB | Cubloc Studio PLC Information File (Comfile Technology Inc.) |
| .CUBE | Cubicomp PictureMaker Bitmap |
| .CUBE | Gaussian Cube File |
| .CUBE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CUBI | Cubicomp PictureMaker Bitmap |
| .CUC | SeeYou Contest File (Naviter) |
| .CUE | BPM Studio Cue Points (ALCATech) |
| .CUE | Cue Cards Data (Microsoft Corporation) |
| .CUE | CDRWin and Others Description File for a CD-Image |
| .CUE | CUEcards 2000 Database (Marcus Humann) |
| .CUF | Turbo C Utilities Form Definition (Borland Software Corporation) |
| .CUL | Cubloc Studio PLC Information File (Comfile Technology Inc.) |
| .CUL | IconForge/ImageForge Cursor Library |
| .CUP | OzWin CompuServe E-mail/Forum Access Catalog Library Update |
| .CUP | SeeYou Waypoint (Naviter) |
| .CUP | Roland Garros Tennis Terrain File |
| .CUR | Windows Cursor (Microsoft Corporation) |
| .CUREXSCHEME | CursorXP Theme (Stardock Corporation, Inc.) |
| .CURL | URL Links Curl |
| .CURSOR | Sun Icon/Cursor |
| .CURSOR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CURV | Genetica Mathematical Curve (Spiral Graphics Inc.) |
| .CURVE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CURXPTHEME | CursorXP Theme (Stardock Corporation, Inc.) |
| .CUS | Medlin Accounting Customer Data (Medlin Accounting) |
| .CUS | ConciseURI Syntax (Clear Methods, Inc.) |
| .CUS | AutoCAD Custom Dictionary (Autodesk, Inc.) |
| .CUS | Payroll Mate 2008 Customer Data (RealTaxTools.com) |
| .CUSTOM | Personal Paint Custom Language User Interface File (Amiga) |
| .CUT | INMOS Transputer Development System Occam Utility Package |
| .CUT | BPM Studio Cue Points and Marker Information (ALCATech) |
| .CUT | Utilitaires |
| .CUT | Dr. Halo Bitmap Graphic |
| .CUT | DataWave Physiological Data File |
| .CUT | CLAN Disambiguation Rules (Child Language Data Exchange System) |
| .CUTLIST | Asfbin Assistant Cut Data |
| .CUZ | CropWalker |
| .CU_ | Winhelp Compressed File |
| .CV | CodeView Information (Microsoft Corporation) |
| .CV | Versions Archive (Corel) |
| .CV3 | Civilization III Game High Score (Firaxis Games, Inc.) |
| .CV4 | CodeView Colors (Microsoft Corporation) |
| .CV5 | Canvas Version 5 |
| .CV5 | CCS-lib.2 JPEG Stream File |
| .CVA | Compaq Diagnostics (Hewlett-Packard Development Company, L.P.) |
| .CVB | Borland BDE File (Borland Software Corporation) |
| .CVD | Calamus Vector Graphic (invers Software) |
| .CVD | Yamaha Custom Drums (Yamaha Corporation of America) |
| .CVD | Clam AntiVirus Database (Clam AntiVirus Team) |
| .CVD | ClamWin AntiVirus Database (Clam AntiVirus Team) |
| .CVD | CVTracker Dictionary File (Netmap Software Inc.) |
| .CVF | SuperStor Compressed Volume |
| .CVF | Jet-VoiceMail Audio Data (COWON America, Inc.) |
| .CVF | Train Simulator Cab View File (Microsoft Corporation) |
| .CVG | Calamus Vector Graphic (invers Software) |
| .CVG | CVTracker Personal Goal File (Netmap Software Inc.) |
| .CVH | Sound File |
| .CVH | CVTracker Proprietary Help File (Netmap Software Inc.) |
| .CVIP | CVIPlab File |
| .CVJ | Cabinet Vision Solid Job Document (Planit Solutions, Inc.) |
| .CVL | Coastal Vector List Text Format |
| .CVL | VLBI and Tied Array Cover Letter Tasking Document |
| .CVN | Yamaha Custom Voices (Yamaha Corporation of America) |
| .CVP | WinFax Cover Page (Symantec Corporation) |
| .CVP | Portrait |
| .CVP | Kodak File |
| .CVQ | Coastal Vector List Compressed Format |
| .CVR | WinFax Cover Page (Symantec Corporation) |
| .CVR | ElectraSoft Fax Cover Sheet |
| .CVR | Bitware Fax File |
| .CVS | Outlook Express File |
| .CVS | Canvas Drawing File |
| .CVS | Sound File |
| .CVSAUTO | Call Management System (CMS) Automatic Script (Avaya Inc.) |
| .CVSIGNORE | Snort File |
| .CVT | dBASE Converted Database Backup |
| .CVT | Convert Data File (Joshua F. Madison) |
| .CVT | Follett Conversion Tool |
| .CVT | CVTracker Position and Company Template File (Netmap Software Inc.) |
| .CVW | Giza Specifier Carera View (20-20 Technologies) |
| .CVW | CodeView Colors (Microsoft Corporation) |
| .CVW | Analytics Cube Report (Actuate Corporation) |
| .CVX | Canvas Versions 6, 7, 8, 9 Graphic File (ACD Systems Ltd.) |
| .CW | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CW | CodeWallet Pro Secure Database (Developer One, Inc.) |
| .CW2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CW3 | Crossword Construction Kit Puzzle Group |
| .CW3 | Claris Works Win 3 Document |
| .CW3 | Chem Draw Molecular Structure |
| .CW6 | COMPRESS Windows Version Pressure Vessel Data File (Codeware Inc.) |
| .CWA | Castelware Inventory Hardware/Software Audit File (Castelware GmbH) |
| .CWA | See .CLC |
| .CWB | WebNote Document |
| .CWC | CADfix Wizard Configuration File (ITI TranscenData) |
| .CWD | StarDraft CWAD File |
| .CWD | Cardwar Card Deck (Stefan Sarbok) |
| .CWDOC | CopyWrite Project Document (Bartas Technologies) |
| .CWE | Crossword Express (AUS-PC-SOFT) |
| .CWEB | C Web |
| .CWF | CodeWatch for Windows Workspace File (Liant) |
| .CWG | Castle of the Winds Saved Game |
| .CWK | GCPrevue Work File (Graphicode) |
| .CWK | ClarisWorks Data File (FileMaker, Inc.) |
| .CWK | CattleMax Data File (Cattlesoft, Inc.) |
| .CWL | ClarisWorks Library |
| .CWP | Cakewalk SONAR Audio Project (Cakewalk) |
| .CWPB | CopyWrite Project Binder (Bartas Technologies) |
| .CWR | Wrapcandy Candy Wrapper (Wrapcandy.com) |
| .CWR | Crystal Reports Report (Crystal Decisions) |
| .CWS | Claris Works Template |
| .CWS | combustion Workspace (Discreet) |
| .CWW | Crossword Weaver File |
| .CWZ | CropWalker File |
| .CW_ | Corel Graphics Ver. 10 Workspace (Corel) |
| .CX | CodeMapper Script |
| .CX3 | click.EXE 3.0 Script File (ASXperts Inc.) |
| .CXB | ComicGuru (Fay Solutions) |
| .CXB | Custody X Change Data File (Custody X Change, Inc.) |
| .CXC | Custody X Change Data File (Custody X Change, Inc.) |
| .CXD | SimplePCI Combined Graphics and Data (Compix Inc., Imaging Systems) |
| .CXE | Common XML Envelope |
| .CXF | Chemical Abstracts Exchange Format |
| .CXH | Custody X Change Data File (Custody X Change, Inc.) |
| .CXI | COMPAxiON Compressed File (Xitech (Europe)) |
| .CXL | ConsoXL Project File (jepib) |
| .CXL | Business Integrator Extract Schema (Pervasive Software Inc.) |
| .CXM | QuadColor Color Correction Master |
| .CXM | XYZ-Company.com Proprietary File |
| .CXO | CXInsight Export File (CodeMatrix Ltd.) |
| .CXP | CX-Programmer PLC Program File (Binary) (Omron Electronics LLC) |
| .CXP | Core Media Player XML-based Playlist File (CoreCodec, Inc.) |
| .CXP | XYZ-Company.com Proprietary File |
| .CXS | ConciseXML Format File (Clear Methods, Inc.) |
| .CXT | Crocodile Technology Circuit (Crocodile Clips Ltd) |
| .CXT | CX-Programmer PLC Program File (Text) (Omron Electronics LLC) |
| .CXT | Vegas Jackpot Gold Game Data File |
| .CXT | Macromedia Director Protected Cast File |
| .CXV | Custody X Change Data File (Custody X Change, Inc.) |
| .CXV | CryptoEx Volume File (Navastream) |
| .CXX | Visual C++ Source Code File (Microsoft Corporation) |
| .CXX | Zortech C++ Program |
| .CXX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CX_ | C Poet Compressed Disk1 File |
| .CY | CCS-lib.2 JPEG-v4 File |
| .CYA | Cyan Color Separation (Adobe Systems Incorporated) |
| .CYC | CYCAS Design Project (Verlag Frese) |
| .CYCLE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .CYG | Pollux Data (CyGem, ltd.) |
| .CYI | Clustify Input File (Hot Neuron LLC.) |
| .CYL | Ribbons Molecular Cylinder |
| .CYM | Callus Game Sound File (Bloodlust Software) |
| .CYN | Cynex Root55 Program Extension |
| .CYO | Clustify Output File Containing Cluster ID (Hot Neuron LLC.) |
| .CYP | Crocodile Physics Simulation File (Crocodile Clips Ltd.) |
| .CYP | FCB Cypher Knot Diagram (International Guild of Knot Tyers) |
| .CYP | Cypherus Encrypted Archive |
| .CYS | Clustify Clustering Summary (Hot Neuron LLC.) |
| .CYT | Crocodile Technology Simulation (Crocodile Clips Ltd.) |
| .CZD | The Crash Zone Drawing (The CAD Zone) |
| .CZE | Personal Paint Czech Language User Interface File (Amiga) |
| .CZE | NHL Ice Hockey 2002 Required File |
| .CZIP | ZipGenius Compressed Archive (M.Dev Software) |
| .CZP | Cloze Pro Archive (Crick Software Ltd.) |
| .C_ | Winhelp Compressed File |
| .C_M | Eru/erd File |
| .C__ | C++ Source; C__ is C++ in Win32 |
| .C~G | Windows 3.x System File |