| File extension Name |
extension description |
| .K | Desktop Color Separation Specification Black Layer |
| .K | NRJ Live File |
| .K | IRIS Editor Format File (eurobraille) |
| .K00 | Tonline DB File |
| .K01 | Clarion DOS Database Key File (SoftVelocity) |
| .K01 | Tonline DB File |
| .K02 | Tonline DB File |
| .K02 | Clarion DOS Database Key File (SoftVelocity) |
| .K03 | Tonline DB File |
| .K03 | Clarion DOS Database Key File (SoftVelocity) |
| .K04 | Clarion DOS Database Key File (SoftVelocity) |
| .K05 | Clarion DOS Database Key File (SoftVelocity) |
| .K06 | Clarion DOS Database Key File (SoftVelocity) |
| .K07 | Clarion DOS Database Key File (SoftVelocity) |
| .K08 | Clarion DOS Database Key File (SoftVelocity) |
| .K09 | Clarion DOS Database Key File (SoftVelocity) |
| .K1S | Wave Glib19 File |
| .K2 | Kar2ouche Storyboard File |
| .K25 | Kodak DC25 Digital Camera File |
| .K25 | Kurzweil 2500 Sample (Kurzweil Music Systems, Inc.) |
| .K3D | 3DS Macro Language Description |
| .K4E | Karaoke 4 Everyone.com Player/Editor File (Karaoke 4 Everyone.com) |
| .K7 | DCMO6 Emulator Tape Image |
| .KA | Karma Asset |
| .KAF | Resurrection Matchmaker! MapPack (Wildman-Productions) |
| .KAL | KManager Calibration Data File (Hondata, Inc.) |
| .KAL | Sfkal Calender Kal_40 File |
| .KAN | Kwalitan Annotation (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KAP | MapInfo Sea Chart (MapInfo Corporation) |
| .KAR | FOX+ 2.0 |
| .KAR | Keep-It Archive (Remember International Associates Ltd) |
| .KAR | Karaoke MIDI File |
| .KAT | Katorzer Music Composition |
| .KAU | KeyAudit Software Audit |
| .KAW | Karma Workspace |
| .KB | Knowledge Pro Source Code |
| .KB | C++ Keyboard Script (Borland Software Corporation) |
| .KBD | Keyboard Script File Layout (Microsoft Corporation) |
| .KBD | Dungeon Lords Game Data (Typhoon Games (HK) Ltd.) |
| .KBD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KBF | MyInfo Documnet/Outline (Milenix Software) |
| .KBI | Keirsey-Bates Temperament Sorter Index |
| .KBM | Reflection Keyboard Script File Layout |
| .KBM | Scala Keyboard Mapping |
| .KBN | TeamSpeak Keybinding File (TeamSpeak Systems) |
| .KBP | Keirsey-Bates Temperament Sorter Profile |
| .KBR | The Drums Pro file |
| .KBR | Keirsey-Bates Temperament Sorter Data |
| .KBS | ACE Studio Model Builder |
| .KBX | AVG Keyboard Shortcut Definitions (AVG Technologies) |
| .KBX | KBOX Heroes Factory File (KBOX Team) |
| .KCC | KeywordConvert Keyword/Phrase Combine List (FormatBlue Software) |
| .KCF | Sony Ericsson Remote Control Configuration |
| .KCF | KiSS Configuration File |
| .KCH | KChess Notation File (Ark Angles) |
| .KCL | KeywordConvert Keyword/Phrase List (FormatBlue Software) |
| .KCL | Kyoto Common LISP Source Code |
| .KCO | Kwalitan Codes (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KCP | Keychamp File |
| .KCT | Kwalitan Categories (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KDB | KeePass Password Database (ver 1.x) (Dominik Reichl) |
| .KDB | kusziDataBase Database File (kusziNET) |
| .KDB | Doobs Database (Kyuran's World) |
| .KDB | kinodb File (datb) |
| .KDBX | KeePass Password Database (ver 2.x) (Dominik Reichl) |
| .KDC | Kwalitan Document (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KDC | Kodak RAW Bitmap Image (Eastman Kodak Company) |
| .KDELNK | KDE Desktop |
| .KDEVELOP | KDevelop Global Project Configuration Information (KDevelop Team) |
| .KDEVPRJ | KDevelop Project File (KDevelop Team) |
| .KDEVSES | KDevelop Specific Behavior Configuration File (KDevelop Team) |
| .KDF | Kinkos Photo (Kinko's, Inc.) |
| .KDF | VisiQuest (Khoros) Standard Data Format (AccuSoft) |
| .KDH | CAJViewer |
| .KDK | Kodak Proprietary Decimated TIFF Format |
| .KDO | Kudo Picture Browser |
| .KDT | Medbasin Evaporation Data (National Technical University of Athens, Laboratory of Reclamation Works & Water Resources Management) |
| .KDW | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KE$ | Modem Bitware Fax Disk2 File |
| .KED | KEDIT Profile and Macro File |
| .KEN | Player CDcheck Compressed File |
| .KEP | SapShow Training File (SAP) |
| .KEP | Turbo Pascal DOS TP19 Compressed Kepler File (Borland Software Corporation) |
| .KERNEL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KES | Kurzweil 1000 and 3000 Accessible Documents (Kurzweil Educational Systems, Inc.) |
| .KEV | JAWS for Windows Preload File (Freedom Scientific) |
| .KEX | KEDIT Macro File |
| .KEX | Haxial KRE KRE Executable (Haxial Software Pty Ltd.) |
| .KEXI | Kexi Native Database File (KDE e.V.) |
| .KEXIS | Kexi Database Connection Parameter File (KDE e.V.) |
| .KEXT | Mac OS X Kernel Extension (Apple Inc.) |
| .KEY | FractInt Demo Script |
| .KEY | Program Security or Registration File |
| .KEY | National Construction Estimator 32 Costbook Key File |
| .KEY | Kaspersky Anti-virus Toolkit Key File (Kaspersky Lab) |
| .KEY | Sentry 2020 Encryption File |
| .KEY | TBAV File |
| .KEY | Top Secret Crypto Gold (TAN$TAAFL Software Company) |
| .KEY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KEY | AntiVir PersonalEdition License Key File (AntiVir PersonalProducts GmbH) |
| .KEY | Keyboard Definition File |
| .KEY | Infinity Game Engine Directory of Resources, Locations and Types (BioWare Corp.) |
| .KEY | Business Key Accounting File (Universal Systems) |
| .KEY | BioWare Aurora Engine Resource File (BioWare Corp.) |
| .KEY | Notes 5 Full Text Index (IBM) |
| .KEY | Keynote Presentation Wrapper Folder (Apple Inc.) |
| .KEY | OS/2 Archive .KEY-file |
| .KEY | Forecast Pro Datafile |
| .KEY | ArcView Geocoding Matching Keys (ESRI) |
| .KEY | DataCAD Icon Toolbar File (DATACAD LLC) |
| .KEY | Avira Product Key (Avira GmbH) |
| .KEY | Diablo II Key File (Blizzard Entertainment) |
| .KEY1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KEYBOARD | Amaya Configuration |
| .KEYCHANGER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KEYNOTE | iWork Keynote File (Apple Inc.) |
| .KEYS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KE_ | Ntgraph Ze32v215 File |
| .KF2 | Max Payne Model File (Rockstar Games) |
| .KFA | IRIS Shortened Format (eurobraille) |
| .KFA | Dark Age of Camelot Animation |
| .KFI | IRIS Native Data File (eurobraille) |
| .KFL | KFLog Airfield File |
| .KFL | IRIS Literary (eurobraille) |
| .KFL | Kwalitan Filter (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KFL | Pegasus Mail Auto-Reply Memory File (David Harris) |
| .KFM | KEY Form Designer Form Design (Broderbund) |
| .KFM | GameBryo KFM File (Emergent Game Technologies) |
| .KFN | KaraFun Karaoke Song (RECISIO S.A.R.L.) |
| .KFP | Kinkos File Prep Tool |
| .KFS | Max Payne Model File (Rockstar Games) |
| .KFS | Pegasus Mail Static Kill File (David Harris) |
| .KFT | Matrox X Tools Keyframe (Matrox Electronic Systems Ltd.) |
| .KFX | KoFax Group 4 Image |
| .KFX | 2D Graphic |
| .KGB | Kremlin Encrypt File |
| .KGB | KGB Archiver Compressed Archive (Tomasz Pawlak) |
| .KGB | Z80 Spectrum Emulator Snap/File Format |
| .KGP | Image |
| .KHD | ViewChoice (Payroll Associates, LLC) |
| .KHF | Kwalitan Tree Structure (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KHS | Kwalitan History (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KHTMP | Google Earth Temporary Object Location (Google) |
| .KIC | Kodak Image Compression File (Eastman Kodak Company) |
| .KICK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KICK3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KID | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KID | Tonline Bsw4 Install Mdmimp File |
| .KID | Kidspiration (Inspiration Software, Inc.) |
| .KIF | Knowledge Interchange Format Draft Proposition |
| .KIF | AutoCAD Key Index (Autodesk, Inc.) |
| .KIK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KIL | Interview File |
| .KILLER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KIM | Commodore KIM-1 Program Image File |
| .KIN | Kinemage Chemical Protein Language |
| .KIP | OA-KIP Client Data Transfer File (van Ovost Automatisering b.v.) |
| .KIT | Battery Drum Kit (Native Instruments) |
| .KIT | 20-20 Design Kitchen Design (20-20 Technologies) |
| .KIT | Power Chord Drum Kit |
| .KIT | Raven Toolkit File |
| .KITCHEN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KITTEN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KIX | KiXtart Script |
| .KIZ | Kodak Digital Postcard File |
| .KIZ | UUencoded File |
| .KJV | TheWord & Bible Companion King James Version Bible |
| .KK1 | ViewChoice (Payroll Associates, LLC) |
| .KK2 | ViewChoice (Payroll Associates, LLC) |
| .KKT | TTSKONE |
| .KKW | RoboHELP Keyword Help Project Index File |
| .KL | Haxial Compiler Haxial KL Source File (Haxial Software Ltd.) |
| .KLA | KLARFF Map Data |
| .KLB | Klemmbretter |
| .KLB | GraphicWorks Album |
| .KLD | Dungeon Keeper 2 Playable Map (Electronic Arts, Inc.) |
| .KLI | KalKulator Linear Algebra File |
| .KLIP | KlipFolio Klip (serence inc.) |
| .KLN | COLOGNE Multilingual Transliteration Scheme |
| .KM | COOL Biz Database Diagram (Sterling Software, Inc.) |
| .KM | BMC Software Patrol File |
| .KM2 | ActiveModeler Professional Process Map (KAISHA-Tec Co. Ltd.) |
| .KM3 | Kernel MetaMetaModel |
| .KMA | Video Hoster Karaoke File (Micro Technology Unlimited) |
| .KMA | Kodak Memory Album (Kodak) |
| .KMA | Correlate K-Map Structure (Correlate AS.) |
| .kmap | lyx Keymap |
| .KMC | Correlate (Correlate AS.) |
| .KMD | Model Browser File (Metis) |
| .KMD | Media Desktop File (Kaaza) |
| .KMD | AIMAX Keyboard Macro (TA Engineering) |
| .KMD | ABSTAT for Windows Batch File (AndersonBell Corp) |
| .KMD | Clicker Module Output |
| .KMDR | Kommander (KDE Web Dev Team) |
| .KMF | Kwalitan Memo (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KML | Kedit Macro Library |
| .KML | HP48 Emulator Win48 Script |
| .KML | Emu48 Emulator Keyboard Configuration File |
| .KML | Keyhole Placemark (Google) |
| .KML | Google Earth Placemark (Google) |
| .KMN | SIL Hebrew Font System Keyboard |
| .KMP | Ketchum Media Player Playlist (Ketchum Software Inc.) |
| .KMP | Correlate K-Map KnowledgeMap (Correlate AS) |
| .KMP | Knowledge Manager Knowledge Base Compressed Map (Hypersoft-net) |
| .KMP | Korg Trinity KeyMaP File |
| .KMP | KORG Trinity/Triton Multisample (KORG) |
| .KMS | Model Browser Shortcut (Metis) |
| .KMS | Correlate Solution Topics (Correlate AS.) |
| .KMV | Model Browser File (Metis) |
| .KMY | KMyMoney Decompressed XML Data |
| .KMZ | Google Earth Saved Working Session (Google) |
| .KMZ | Correlate K-Map Zipped KnowledgeMap (Correlate AS) |
| .KM_ | Seqmax Seqprest Compressed Audio File |
| .KND | NEPLAN NEPLAN-DOS Import/Export File (BCP Busarello + Cott + Partner Inc.) |
| .KNF | Orchida Knitting System (Orchida Soft) |
| .KNF | Personal Knowbase Custom Import Filter (Bitsmith Software) |
| .KNF | Universal Flat Knitting Machine Pattern Design |
| .KNN | Clarion for Windows Database Key (SoftVelocity) |
| .KNO | Personal Knowbase Data (Bitsmith Software) |
| .KNOW | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KNT | KeyNote Note File (Marek Jedlinski) |
| .KNW | Known Problems |
| .KO | IBM/Tools/Updater File |
| .KOA | Koala Paint C64 Bitmap |
| .KOD | Code |
| .KOE | Turbo Pascal DOS File (Borland Software Corporation) |
| .KOK | DEL MP3 Karaoke |
| .KOM | Kit-O-Mat 3D Model File (KingMill Enterprises LLC) |
| .KON | Konfabulator Widget Code (Konfabulator) |
| .KOR | Correction File |
| .KOR | Korean Text File |
| .KOS | MicroType Pro Document |
| .KOSIMA | Kosima File |
| .KOURSE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KOZ | Sprint Music Store Music Download for Phone (Sprint Nextel) |
| .KPD | Kapital Database File (K Software) |
| .KPF | Kapere |
| .KPF | Komodo Project File (ActiveState Software) |
| .KPG | Kai'S Power Goo Graphic |
| .KPJ | K Database Magic Project File (Sandor Kovacs) |
| .KPL | Kazaa Playlist |
| .KPL | KPL Source Code |
| .KPP | Kudo Place Pack, Place Module |
| .KPP | SmartPad Toolpad |
| .KPP | Kid Pix Deluxe Slide Show (Broderbund) |
| .KPPX | Keypoint Presentation (Digitalsoft) |
| .KPR | KPresenter Slide Show (KOffice Web Team) |
| .KPR | Kwalitan Project (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KPR | Fifa World Cup Game Data Comon be File |
| .KPS | IBM KIPS Bitmap |
| .KPT | KPresenter Template (KOffice Web Team) |
| .KPX | Kid Pix Deluxe Data File (Broderbund) |
| .KQL | Kyle's Quest Level Editor Graphic (Crimson Fire Entertainment) |
| .KQP | Konica Quality Picture |
| .KR1 | Kurzweil 2000 Sample (Kurzweil Music Systems, Inc.) |
| .KRA | Krita Image (The KDE Project) |
| .KRA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KRACK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KRACKS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KRAK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KRAW | BRSTM Audio Stream (Nintendo) |
| .KRAW | Macintosh OS X Kernel-Raw Image Format (Apple Inc.) |
| .KRC | Mouse and Key Recorder Recorded File (Kra-Tronic Corporation) |
| .KRIS | Kris Tracker Format Song |
| .KRISTAL | KRISTAL Audio Engine Project File (Kreatives.org) |
| .KRK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KRK | Xbox Music Mixer Karaoke-enabled Music File (Microsoft Corporation) |
| .KRN | NBA99 Ice Hockey Foreground Font |
| .KROMHE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KRP | HiCAD 3D Part File (ISD Benelux B.V.) |
| .KRX | Karaoke MIDI File |
| .KRY | Herolab Krypten |
| .KRZ | Kurzweil 2000 Sample (Kurzweil Music Systems, Inc.) |
| .KS | Works Sheet (Microsoft Corporation) |
| .KS | SOF Game File Log |
| .KSC | Korg Trinity Script |
| .KSC | KORG Trinity/Triton Script (KORG) |
| .KSE | Keepsake Studio Export File |
| .KSF | Kick it Up Stepfiles |
| .KSF | KORG Trinity/Triton Sample (KORG) |
| .KSG | Kwalitan Segment (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KSH | Prodigy Internet Registration File |
| .KSH | UNIX Shell Script |
| .KSH | Dazzle Dazzle Realization |
| .KSHRC | UNIX Kom Shell Environment File |
| .KSL | Karaoke Song List Creator Song List (Airwer) |
| .KSM | Kefrens-Sound Machine Format Song |
| .KSM | Ken Silverman Music Format |
| .KSM | Embroidery File Format for Pfaff Machines |
| .KSS | FabTrol MRP Template File (FabTrol Systems, Inc) |
| .KSS | MSX Music File |
| .KSS | KDE [UNIX/Linux Desktop] Screen Saver (KDE) |
| .KSS | K-ForCE Scoresheet File (Stephan Rakonza) |
| .KST | Olivetti Olitext Plus Script File |
| .KSW | Kepler Scientific Workflows (Kepler Project) |
| .KT2 | BATTERY 2 Drum Kit (Native Instruments) |
| .KTE | FoilMaker Kite Design |
| .KTH | Keynote Theme File (Apple Inc.) |
| .KTI | Kelvin TOP-SET Investigator Investigation Data (The Kelvin Consultants Limited) |
| .KTK | Kutoka's Mia |
| .KTP | Clarion for Windows Temporary Key File (SoftVelocity) |
| .KTT | KeyText Data File |
| .KTX | Kwalitan Text (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KU | Knowledge Explorer Knowledge Representation Knowledge Unit |
| .KUMAC | Physics Analysis Workstation Macro File |
| .KUP | Karaoke Song List Creator (Airwer) |
| .KV3 | KM-NET Viewer Database (Kyocera Mita Corporation) |
| .KVA | KVIrc Add-on (KVIrc Development Team) |
| .KVB | Klick-N-View Business Cards |
| .KVC | KVIrc Configuration (KVIrc Development Team) |
| .KVQ | Sega Smash Pack PC Version File (Sega of America, Inc.) |
| .KVS | KVIrc Script (KVIrc Development Team) |
| .KVT | BASIC QuickBAS QuickB03 File |
| .KVT | KVIrc Theme (KVIrc Development Team) |
| .KVW | Google Earth Workspace (Google) |
| .KW$ | NTgraph Visual C Wizzard File |
| .KW3 | KanjiWORD Document (Pacific Software Publishing, Inc.) |
| .KWB | KeyWord Braille File (Pulse Data International Ltd) |
| .KWB | Kwalitan Workfile (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KWC | KeyWallet Compressed Skin (KeyWallet GbR) |
| .KWD | Dungeon Keeper 2 Playable Map (Electronic Arts, Inc.) |
| .KWD | Keyword |
| .KWD | KWord File (KWord Team) |
| .KWF | Delphi Pascal Chart |
| .KWF | Kartex |
| .KWF | Kwalitan Word List (Vincent Peters, Department of Research Methodology, University of Nijmegen, The Netherlands) |
| .KWI | Navigation System Data File (KIWI Format) |
| .KWIC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .KWO | KeyWallet Object (KeyWallet GbR) |
| .KWS | Kyocera Ringtone |
| .KWS | KeyWallet Skin (KeyWallet GbR) |
| .KXS | Kexis Lossless Compressed Audio |
| .KY | Peachtext List Manager (Peachtree Software (Sage Software SB, Inc.)) |
| .KYB | Keyboard Layout |
| .KYE | Kye Game Data |
| .KYF | Visual-Voice Mouth Movement File |
| .KYS | Photoshop CS Keyboard Shortcut (Adobe Systems Incorporated) |
| .KYS | Premiere Keys File (Adobe Systems Incorporated) |
| .KYS | SourceOffSite Server Keys |
| .KZM | Karizma Designer Album File (Karizma) |
| .KZP | Kazoo3D or KazooStudio KazooPicture |