| File extension Name |
extension description |
| .M | Winamp3 Uncompiled Script |
| .M | Objective-C Source |
| .M | Miranda language Script File |
| .M | MATLAB Function or Script (The MathWorks, Inc.) |
| .M | Mathematica Functions and Commands (Wolfram Research, Inc.) |
| .M | Maple Common Binary File (Maplesoft, a Division of Waterloo Maple Inc.) |
| .M | Limbo Interface Declaration |
| .M | Desktop Color Separation Specification Magenta Layer |
| .M | Cliq Accessories Datebook Modification File |
| .M | Brief Macro Source |
| .M | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .M | Amiga E Source Module (Wouter van Oortmerssen) |
| .M$S | MindStor Firmware Update File |
| .M01 | MicroStation Modification Resource (Bentley Systems, Incorporated) |
| .M0D | Malete Options (Record 0) File (OpenIsis) |
| .M11 | MASS11 Text File |
| .M11 | Farallon's MacRecorder Format Sampling Rate 11k |
| .M12 | Hydrographs Synthesis Project File |
| .M12 | S-BASIC File |
| .M12 | SHARP MZ-series Emulator File |
| .M12 | Proprietary Data Format for Interchange of Defense Form Data with Mil-Pac Technology Software Products |
| .M14 | Steuer2001 File |
| .M15 | Apple MPEG-1 Video (Apple Inc.) |
| .M15 | thinEdge Model (Petr Schreiber) |
| .M18 | Accolade Golf Course File |
| .M1A | Apple MPEG-1/2 Audio (Apple Inc.) |
| .M1A | MPEG-1 Audiostream |
| .M1C | IBM Voice Type Language Newuser File |
| .M1I | IBM Voice Type Language Newuser File |
| .M1PG | iFinish Video Clip (Media 100 Inc.) |
| .M1S | MPEG Media File |
| .M1V | MPEG-1 Video File |
| .M2 | Modula 2 Language Source |
| .M21 | AXMEDIS MPEG-21 File (AxMediaTech S.R.L.) |
| .M22 | Farallon's MacRecorder Format Sampling Rate 22k |
| .M29 | Turbo Smetchik (Data Basis) |
| .M2A | MPEG-2 Audio |
| .M2A | Apple MPEG-1/2 Audio (Apple Inc.) |
| .M2C | IBM Voice Type Language Newuser File |
| .M2I | IBM Voice Type Language Newuser File |
| .M2O | Modula Fitted Modula2 File |
| .M2P | MPEG-2 Program Stream Format File |
| .M2S | MPEG-2 Audio and Video |
| .M2TS | Blu-ray BDAV MPEG-2 Transport Stream (Blu-ray Disc Association) |
| .M2V | MPEG-2 Video Only File |
| .M3 | Modula 3 Program File |
| .M32 | Dr.T MIDI File |
| .M3A | MPEG Archive Enhanced .M3U Playlist File |
| .M3C | IBM Voice Type Language Newuser File |
| .M3D | Cossacks Map File (cdv Software Entertainment USA) |
| .M3D | EverQuest File |
| .M3D | Corel Motion 3D Animation |
| .M3D | 3D Animations Macro |
| .M3G | Mobile 3D Graphic |
| .M3G | Nokia Phone Screen Saver (Nokia) |
| .M3I | IBM Voice Type Language Newuser File |
| .M3S | Myst III Exile Saved Game (Cyan Worlds, Inc.) |
| .M3U | MP3 Playlist File |
| .M3U8 | MP3 Playlist File (UTF-8) |
| .M3URL | MP3 Playlist File |
| .M4 | Meta4 Source Code (Meta4) |
| .m4 | m4 Macro |
| .M4A | MPEG-4 Audio Layer |
| .M4B | MPEG-4 Audio Layer Bookmarkable File |
| .M4C | IBM Voice Type Language Newuser File |
| .M4I | IBM Voice Type Language Newuser File |
| .M4P | Protected AAC File (Apple Inc.) |
| .M4R | iPhone Ringtone (Apple Inc.) |
| .M4S | Myst IV: Revelation Saved Game (Cyan Worlds, Inc.) |
| .M4T | Sage Mas 200 Table File (Sage Software) |
| .M4U | Ogg Media Redirector File |
| .M4V | MPEG-4 Video File |
| .M64 | Mupen64 Movie Capture |
| .M68 | Turbo Pascal DOS File (Borland Software Corporation) |
| .M7 | Farallon's MacRecorder Format Sampling Rate 7k |
| .M75 | Apple MPEG-1 Video (Apple Inc.) |
| .M7A | Mapking Map (Matlas Technologies, Inc) |
| .M7A | Yamaha Synthesizer Internal User Memory File (Yamaha Corporation) |
| .M8 | Grlib Scry PCserv File |
| .M8 | Heretic II MipMap |
| .M?? | Ingres Modify Table/Index File (Computer Associates International, Inc.) |
| .MA | Mathematica ASCII File (Wolfram Research, Inc.) |
| .MA | Homeworld Maya Scene File (Sierra Entertainment, Inc.) |
| .MA | hDC Products for MicroApp Executable Files |
| .MA | Diablo II Map File (Blizzard Entertainment) |
| .MA | Maya ASCII Scene (Alias Systems, a division of Silicon Graphics Limited) |
| .MA0 | Diablo II (Blizzard Entertainment) |
| .MA1 | Diablo II (Blizzard Entertainment) |
| .MA1 | SKY Mobile Phone Icon/Ringtone |
| .MA2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MA2 | Diablo II (Blizzard Entertainment) |
| .MA3 | Harvard Graphics Macro (Harvard Graphics) |
| .MA3 | Diablo II (Blizzard Entertainment) |
| .MAB | Mozilla (Netscape) Personal Addressbook or Collected Addressbook (Mozilla) |
| .MAC | Access Shortcut (Microsoft Corporation) |
| .MAC | Geometry II Plus Macro File (Cabrilog) |
| .MAC | Dynamics GP Macro (Microsoft Corporation) |
| .MAC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAC | Macro |
| .MAC | MacPaint Bitmap Graphic |
| .MAC | PDP-10 MACRO-10 Assembler Compiler Source |
| .MAC | MINITAB Macro (Minitab, Inc.) |
| .MAC | Daqarta Extended Audio Data (Interstellar Research) |
| .MAC | TASM Macro (Borland Software Corporation) |
| .MAC2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAC3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAC4 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MACAPPL | MacDrive (Mediafour Corporation) |
| .MACHACHA | MacHacha Split Control File (Pescados Software) |
| .MACHINE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MACHTYPE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MACP | MacPaint Bitmap Graphic |
| .MACR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MACRO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MACRO2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MACRO3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MACROS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MACS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MACWRITE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAD | Mlat AdLib Tracker |
| .MAD | Access Module Shortcut (Microsoft Corporation) |
| .MAD | Homeworld Model Animation Data (Sierra Entertainment, Inc.) |
| .MAD | Game Movie File (Electronic Arts, Inc.) |
| .MADNESS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MADONNA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MADSTATE | Homeworld Model Animation Script (Sierra Entertainment, Inc.) |
| .MADX | fotoFlag Meta Action Definition XML (flagNtag inc.) |
| .MAE | Maestro Molecular Model (Schrödinger, LLC) |
| .MAEGZ | Maestro Compressed Molecular Model (Schrödinger, LLC) |
| .MAF | Access (Microsoft Corporation) |
| .MAFF | Firefox Mozilla Archive Format Extension Saved Web Page Archive (Mozilla) |
| .MAG | Magic Mail Monitor Mailbox File |
| .MAG | Fortis and File Magic Document File (Westbrook Technologies, Inc.) |
| .MAG | MPS Magro Paint System Graphic |
| .MAG | MagIchan Graphic |
| .MAG | Magenta Color Separation (Adobe Systems Incorporated) |
| .MAG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAG | Access Diagram Shortcut (Microsoft Corporation) |
| .MAG | Magic 1 2 3 Acounting File (Universal Systems) |
| .MAGIC | Magic Mail Monitor Mailbox |
| .MAGICS | Magics Project File (Materialise NV) |
| .MAGNET | Vuze File (Vuze Project Team) |
| .MAGNETICFIELDSIV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAGS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAH | Mahjongg Solitaire Settings |
| .MAHJONGTITANSSAVE-MS | Mahjong Titans Saved Game (Microsoft Corporation) |
| .MAI | Sony Video Thumbnail (Sony Corporation of America) |
| .MAI | Pegasus Mail Message Directory (David Harris) |
| .MAI | MS Mail Message |
| .MAI | VAX Mail |
| .MAIL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAIL | NeoPlanet Mail Client |
| .MAILABVIEW | MSN AddressBook View (Microsoft Corporation) |
| .MAILBOX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAILHOST | MSN Explorer E-mail Server Preferences File (Microsoft Corporation) |
| .MAILORDER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAILSRV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAILVIEW | MSN Mail Message List (Microsoft Corporation) |
| .MAIN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAJ | Profile Master 2000 Job Data (MAP Ltd.) |
| .MAK | Visual C++ Project (Microsoft Corporation) |
| .MAK | Visual Basic Ver. 3.0 Project (Microsoft Corporation) |
| .MAK | Make File |
| .MAK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAKE | Makefile |
| .MAKE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAKE2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAKEFILE | Makefile |
| .MAKEPP | Makepp Make File (Gary Holt) |
| .MAKER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAKETAIL | Sourcecontrol File |
| .MAKI | Winamp3 Compiled Script (Nullsoft) |
| .MAL | Connect Server Configuration (AvantGo, Inc.) |
| .MAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAL | Webalizer.01 Language File |
| .MALE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAM | Access Macro Shortcut (Microsoft Corporation) |
| .MAN | Windows 2000 Mandatory User Profile |
| .MAN | Manual |
| .MAN | Blaise File (Statistics Netherlands) |
| .MAN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MANAGER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MANGER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MANIFEST | Windows Visual Stylesheet XML File (Microsoft Corporation) |
| .MANNERLY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MANTECA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MANUAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MANUALS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MANX | Manual File |
| .MAP | Blood Game File Map |
| .MAP | AccView Network Map |
| .MAP | MapInfo Map (MapInfo Corporation) |
| .MAP | Atlas MapMaker Map |
| .MAP | Geography Maps |
| .MAP | Pro/ENGINEER (PTC) |
| .MAP | Fenix Map |
| .MAP | Route 66 Card Document |
| .MAP | Duke Nukem Game Level Data File |
| .MAP | SpellForce Level Map (JoWooD Productions Software AG) |
| .MAP | Debug Info Used by Some Programming Languages |
| .MAP | ColorMAP Intensities and Indices Color Palette |
| .MAP | Carnivores / Ice Age Map File (Action Forms, Ltd.) |
| .MAP | Image |
| .MAP | DIV Game Studio Map |
| .MAP | OziExplorer Map (Des & Lorraine Newman) |
| .MAP | 3Com Network Supervisor Network Topolgy Map (3Com) |
| .MAP | Hex Workshop Hex Editor Character Map (BreakPoint Software, Inc.) |
| .MAP | General Surfing Map |
| .MAP | Color Palette |
| .MAP | Ingres Termcap Mapping File (Computer Associates International, Inc.) |
| .MAP | Offline Explorer (MetaProducts Corporation) |
| .MAP | Command & Conquer Red Alert 2 Mission File (Westwood Studios) |
| .MAP | Server-side Image Map |
| .MAP | WorldCraft Quake/Half-Life Game Level File |
| .MAP | Imagination Image Map Editor Image Map Coordinates File (Multimedia Australia Pty. Ltd.) |
| .MAP | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAP | PROGNOSIS Map Document File |
| .MAP | Visual Studio .NET 2002 Linker Map (Microsoft Corporation) |
| .MAP | Diablo II Map (Blizzard Entertainment) |
| .MAP | Poser 3D Map File |
| .MAP | Micrografx Picture Publisher Format Data |
| .MAP | MAPIMail |
| .map | UNIX Map File |
| .MAP | Manifold Map |
| .MAP2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAPF | MainActor Project (MainConcept AG) |
| .MAPIMAIL | Outlook Express Mail File (Microsoft Corporation) |
| .MAPIMAIL | Mail SentTo Drop (Microsoft Corporation) |
| .MAPISEND | MAPISEND File (Microsoft Corporation) |
| .MAPLET | Maplet Design File (Blitz Research Ltd.) |
| .MAPS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAPSAO | Aleph One Maps (Marathon Open Source) |
| .MAPX | MapDotNet Map Definition File (I.S. Consulting, Inc.) |
| .MAQ | Access Query Shortcut (Microsoft Corporation) |
| .MAR | VAX Macro Assembly Program |
| .MAR | Bibliographic Data Format |
| .MAR | Access Report Shortcut (Microsoft Corporation) |
| .MAR | Mar Compressed Archive |
| .MAR | Pegasus Mail Attributes Records Per User (David Harris) |
| .MAR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAR | MSN Archive (Microsoft Corporation) |
| .MAR | WebSphere Business Modeler Process Model Template (International Business Machines Corp.) |
| .MAR | Mozilla Archive (Mozilla) |
| .MARCH | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MARIMBA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MARIO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MARK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MARKE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MARKER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MARM | EPOC Makefile for MARM Platform |
| .MAS | Freelance Graphics Smartmaster File (IBM) |
| .MAS | Nascar SimRacing Data |
| .MAS | Focus Master Data Definition |
| .MAS | QuickCard File |
| .MAS | Access Stored Procedures (Microsoft Corporation) |
| .MAS | WebFOCUS / FOCUS / Web390 MASter File Description (MFD) (Information Builders) |
| .MAS | Make A Storybook Storybook (Kennard Consulting) |
| .MASCOT | Otaku Mascot Mascot (Accursed Toys Inc.) |
| .MASK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MASKA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MASON | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MASS | Mass Downloader Partial Download (MetaProducts Corporation) |
| .MASSAGESOAPBOOK | WinCity Massage SOAP Notes Soap Book (WinCity Custom Software, Inc.) |
| .MASTER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MASTERANDSERVANT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAT | RCSWin Material File (RCS Corporation) |
| .MAT | Poser 3D Pose File |
| .MAT | Vue Materials (e-on software, inc.) |
| .MAT | Ox Object-Oriented Matrix Programming Language Matrix File |
| .MAT | CRiSP Harvest File |
| .MAT | ArcView Geocoding Matching Parameters File (ESRI) |
| .MAT | Sound File |
| .MAT | Animation:Master Material (Hash) |
| .MAT | MATLAB Variables Binary File (The MathWorks, Inc.) |
| .MAT | Access Table Shortcut (Microsoft Corporation) |
| .MAT | 3D Studio Material Library (Autodesk, Inc.) |
| .MAT | Pro/ENGINEER Material Properties File (PTC) |
| .MAT | Freelancer Model Textures File (Microsoft Corporation) |
| .MATH | AnalyticMath (Paul Hunter) |
| .MATH | Amaya |
| .MATH | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MATHCALC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MATILDA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAUC | Multi-Channel Server (MCS) Component Policy Editor Audio Component (Volantis Systems Ltd.) |
| .MAUD | Sound File |
| .MAV | Access View Shortcut (Microsoft Corporation) |
| .MAW | Access Data Access Page (Microsoft Corporation) |
| .MAX | PaperPort Scanned Image (ScanSoft Inc.) |
| .MAX | 3ds Max Studio Max Scene (Autodesk, Inc.) |
| .MAX | Maximizer Contact & E-business Program |
| .MAX | 3D Studio Scene (Autodesk, Inc.) |
| .MAX | Creative Writer Document (Microsoft Corporation) |
| .MAX | OrCAD Layout File (Cadence Design Systems, Inc.) |
| .MAX | PS2 Powersave File |
| .MAX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAX | CryptoMailer Encrypted File (TheGreenBow) |
| .MAX | OmniPage Image (Nuance Communications, Inc.) |
| .MAX | Max Source Code |
| .MAXA | Maxa Crypt Mobile Encrypted File (MAXA Research Int'l Inc.) |
| .MAYBE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MAZ | Hover Maze Data |
| .MAZ | Division's dVS/dVISE File |
| .MAZ | 3ds Max Archived Network Rendering Job (Autodesk, Inc.) |
| .MAZE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MB | Mathematica Binary File (Wolfram Research, Inc.) |
| .MB | MapBasic Program (MapInfo Corporation) |
| .MB | Paradox Memo Holder |
| .MB | Maya Binary Scene (Alias Systems, a division of Silicon Graphics Limited) |
| .MB1 | Apogee Monster Bash Data |
| .MB4 | Model Builder Model Design File (Evan Designs) |
| .MBA | Martus Human Rights Bulletin System (Benetech) |
| .MBB | MannaBook (MannaBook Software, Inc.) |
| .MBD | Multimedia Builder MP3 Authoring File (Mediachance.com) |
| .MBD | Revolution EDX Catalog (4pi Analysis, Inc.) |
| .MBD | Multimedia Builder Data (as-master) |
| .MBF | Corel Visual DTD Document Type Definition for SGML (Corel Corporation) |
| .MBF | Money Backup File (Microsoft Corporation) |
| .MBFAVS | Stardent AVS X Image |
| .MBFS | Stardent AVS X Image |
| .MBG | MS Mail Mailbag |
| .MBG | Mailbag Assistant E-mail Archive |
| .MBI | MBasic Source Code |
| .MBK | Atari (Atari) |
| .MBK | dBASE IV Multiple Index Backup |
| .MBK | VersaPro Motion Block Backup |
| .MBL | Logger Pro Experiment Data File (Vernier Software & Technology) |
| .MBL | Multi-Batch Batch Listing (Engineering Graphics (nsw) pty. Ltd) |
| .MBM | SymbianOS Multi BitMap Image |
| .MBN | Sony Ericsson Mainware File (Sony Ericsson Mobile Communications AB) |
| .MBOX | Unix Mbox Format Mail File |
| .MBP | Mobipocket eBook Auxiliary File (Amazon.com, Inc.) |
| .MBP | Mediabase Package (Digilink B.V.) |
| .MBP | Balder Multiboot Project (HCData) |
| .MBP | Medbasin Project File (National Technical University of Athens, Laboratory of Reclamation Works & Water Resources Management) |
| .MBR | AS/400 Physical File Member (IBM) |
| .MBS | Opera Mailbox File (Opera Software ASA) |
| .MBS | Micrografx Picture Publisher Brush Shape |
| .MBS | Mailbag Assistant Script |
| .MBSA | Microsoft Baseline Security Analyzer Report (Microsoft Corporation) |
| .MBT | HASLEMERE / Other MBT Applications MBT Data File (Modern Business Technology Limited) |
| .MBT | ecBuilder Template |
| .MBTN | Multi-Channel Server (MCS) Component Policy Editor Button Image Component (Volantis Systems Ltd.) |
| .MBU | Neverwinter Nights Music File |
| .MBV | Corel.visualDTD.7 |
| .MBW | MarketBrowser |
| .MBX | Mailbox Message File |
| .MBX | Database Index; dBASE Index |
| .MBX | MapBasic Compiled Program (MapInfo Corporation) |
| .MC | Bricolage Page Template (Bricolage Development Team) |
| .MC | PlaySaver and PSEmuPro Memory Card Save and Single Game Save |
| .MC | MetaCard Script |
| .MC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MC | Windows Localized Message Table Resource |
| .MC | Modula-3 M3CG intermediate Language File |
| .MC | NRC Inspection Manual Chapter |
| .MC$ | Magic Xchange Package |
| .MC1 | MedCalc Data File |
| .MC2 | Mastercook File (Sierra) |
| .MC3 | Bridge Design Modeler 3D Match-Casting Geometry Control |
| .MC3E | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MC4 | MicroCase Data File (Cengage Learning) |
| .MC4D | Cinema 4D v4.x Object (MAXON Computer GmbH) |
| .MC5 | Grafic Jpg Bcc file/microsoft C v5 related file |
| .MC6 | C File/Makefile (Microsoft Corporation) |
| .MC7 | Mastercam 7 File (CNC Software, Inc.) |
| .MC8 | Mastercam 8 File (CNC Software, Inc.) |
| .MC9 | Mastercam 9 File (CNC Software, Inc.) |
| .MCA | HFS Medicare Auditor Medicare Cost Audit (Health Financial Systems) |
| .MCA | ModCA IOCA |
| .MCA | i-deas Web ACCESS File |
| .MCB | NEPLAN Project File (BCP Busarello + Cott + Partner Inc.) |
| .MCB | Merak Email Server Configuration Backup (IceWarp Ltd.) |
| .MCB | Grlib Ravekit File |
| .MCC | Incite Media Assistant File |
| .MCC | Amiga MUI External Class/Library (SASG) |
| .MCC | MathCAD Configuration (Mathsoft Engineering & Education Inc.) |
| .MCC | Dialer10 Calling Card |
| .MCC | Monu-Cad Pro CAD File |
| .MCC | Mylar City Character Editor |
| .MCC | The Microsoft Network Shortcut (Microsoft Corporation) |
| .MCC | VectorWorks/MiniCAD File |
| .MCD | MediaCD Configuration File (Bot Productions) |
| .MCD | Bleem! Memory Card Save |
| .MCD | Craig McDowall.com NotePad |
| .MCD | MathCaD Document (Mathsoft Engineering & Education Inc.) |
| .MCD | MinCAD 7 Drawing/Texture (Nemetschek North America Inc.) |
| .MCD | VectorWorks Drawing (Nemetschek) |
| .MCD | Monu-Cad Pro CAD File |
| .MCF | SignIQ Media Collection File (ImpulseLogic) |
| .MCF | Media Container Format |
| .MCF | Hotsauce Graphics |
| .MCF | Master Command File |
| .MCF | MathCAD Font (Mathsoft Engineering & Education Inc.) |
| .MCF | MAX II Configuration File (Max B.V.) |
| .MCF | Public Browser Platform Configuration File (Myriad Communications Ltd) |
| .MCF | Mastercook Cookbook File (Sierra Entertainment, Inc.) |
| .MCF | TMPGEnc Conversion Template (Pegays Inc.) |
| .MCF | Meta Content Format File |
| .MCH | Xtra Cache File (Macromedia) |
| .MCHT | Multi-Channel Server (MCS) Component Policy Editor Chart Component (Volantis Systems Ltd.) |
| .MCI | Media Control Interface Command Set |
| .MCIF | MacroMolecular Crystallographic Information File |
| .MCL | MUSHclient World Information File |
| .MCL | Multimedia Manager Collection File |
| .MCL | Macro Command Language |
| .MCL | VectorWorks Template (Nemetschek) |
| .MCL | Windows Media Center Application Link (Microsoft Corporation) |
| .MCL | MultiEdit Macro Library |
| .MCM | Enable Macro |
| .MCM | MacMolecule File |
| .MCO | MSN Messenger Wink File (MSN) |
| .MCP | MUSICompress Encoded Audio (Soundspace Audio LLC) |
| .MCP | Capsule Application Script |
| .MCP | NetMC Player Composed Media Multimedia File |
| .MCP | WaveZIP Lossless Compressed Audio |
| .MCP | CodeWarrior Project (Freescale Semiconductor, Inc.) |
| .MCP | MathCAD Printer Driver (Mathsoft Engineering & Education Inc.) |
| .MCP | Amiga MUI Preference Class/Library (SASG) |
| .MCP | MSN Content Plus Installer File Archive (MSN Content Plus Inc.) |
| .MCP | Master Compiler Profile |
| .MCQ | McAfee Quarantined File |
| .MCR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MCR | Freemagic Source Imageanalysis File |
| .MCR | PlaySaver and PSEmuPro Memory Card Save and Single Game Save |
| .MCR | HFS Medicare Auditor Medicare Cost Report (Health Financial Systems) |
| .MCR | Macro Magic Macro (iolo technologies, LLC.) |
| .MCR | DataCAD Keyboard Macro File (DATACAD LLC) |
| .MCR | CuteFTP Script (GlobalSCAPE) |
| .MCR | Perfect Keyboard Macro (Pitrinec Software) |
| .MCR | BricsCad Macro (BricsCad nv) |
| .MCR | Generic CADD Macro |
| .MCR3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MCR3E | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MCRE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MCS | Mimics Project File (Materialise NV) |
| .MCS | VirusScan TC Installation File (Network Associates) |
| .MCS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MCS | MathCAD Format File (Mathsoft Engineering & Education Inc.) |
| .MCS | HalfLife MapCycle - Editor |
| .MCS | The Only Sheet [TOS] Data File (Richard Taillon) |
| .MCT | Musicator |
| .MCT | MapChart Genetic Map Data (Plant Research International) |
| .MCT | MSN Messenger Packaged Wink File (MSN) |
| .MCW | MacWrite II Macintosh Text File |
| .MCW | Word for Macintosh Document (Microsoft Corporation) |
| .MCX | Mastercook File (Sierra) |
| .MCX | MacroX Macro File (Millsoft Software Development) |
| .MCX | Mastercam Computer Aided Machining Design File (CNC Software, Inc.) |
| .MCX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MCX | Intel Connection Fax File |
| .MC_ | Musicato Compressed File |
| .MD | Chaos Desktop Metadata File (Chaos systems AB) |
| .MD | Mayura Draw Vector Drawing File (Mayura Software) |
| .MD | MDCD Compressed Archive File |
| .MD | Technics Keyboard User MIDI Settings File |
| .MD | Mungyodance Data Pack (Empathetic Enteprises) |
| .MD | Teknical eLearning Objects Meta-Data File (Teknical Ltd.) |
| .MD1 | Gear CD Suite File |
| .MD2 | Quake 2 Player Model |
| .MD3 | Quake III Arena Model File (ID Software) |
| .MD5 | ExactFile MD5 Checksum Digest File (StudyLamp Software LLC.) |
| .MD5 | fsum MD5 Checksum File (SlavaSoft Inc.) |
| .MD5 | MD5summer Checksum |
| .MD5 | Checksum File for .SHN Audio |
| .MD5 | IsoBuster MD5 Checksum (Smart Projects) |
| .MD8 | CDrom Database File |
| .MD8 | Mediator Project (MatchWare) |
| .MDA | Meridian Data Slingshot |
| .MDA | Rays Media Data |
| .MDA | Access Add-in (Microsoft Corporation) |
| .MDA | MicroDesign Area File (Creative Technology) |
| .MDA | Access 2 Workgroup (Microsoft Corporation) |
| .MDB | NEi Nastran Modal Database (Noran Engineering, Inc.) |
| .MDB | PTC Pro/MECHANICA File |
| .MDB | ProWORX Nxt Memory Data (Schneider Electric) |
| .MDB | MS File Viewer |
| .MDB | Mediator Multimedia Data |
| .MDB | Access Application (Microsoft Corporation) |
| .MDB | Access Database (Microsoft Corporation) |
| .MDB | Mono Debugging Information (Mono Project) |
| .MDBACKUP | IPhone Backup File (Apple Inc.) |
| .MDC | Pfeiffer Quadstar Mass Spectrometer Data (Pfeiffer Vacuum GmbH) |
| .MDC | MedDC Mail Pouch (Asier Technology Corporation) |
| .MDC | PowerPlay Power Cube (Cognos Incorporated) |
| .MDD | Database Designer for MySQL Database Diagram (MicroOLAP Technologies LTD) |
| .MDD | MacDraft Drawing (Microspot Ltd) |
| .MDE | Tonline Database File |
| .MDE | Access MDE Database File (Microsoft Corporation) |
| .MDE | Office File (Microsoft Corporation) |
| .MDF | Fldigi Macro (Dave Freese, W1HKJ) |
| .MDF | Vector CANape / CANgraph / CANdito Measurement Data (Vector Informatik GmbH) |
| .MDF | Alcohol 120% CD Image File (Alcohol Software) |
| .MDF | Insight II Molecular Data File (Accelrys Software Inc.) |
| .MDF | ProWORX Nxt Memory Data (Schneider Electric) |
| .MDF | SQL Server Master Database File (Microsoft Corporation) |
| .MDF | Menu Definition File |
| .MDF | Star Trek Armada Map File Title & Image Information |
| .MDF | Capture Classic Filler (Accelio) |
| .MDF | I-deas Master Drafting Machine Data File |
| .MDH | Madhyam Hindi Word Processor File (Balendu Sharma Dadhich) |
| .MDHTML | Access HTML File (Microsoft Corporation) |
| .MDI | MIDI-sequention Sound |
| .MDI | Borland Multiple Document Interface (Borland Software Corporation) |
| .MDI | Office Document Imaging File (Microsoft Corporation) |
| .MDK | Schedule File (Ad Astra) |
| .MDL | Moray Wireframe Model (SoftTronics) |
| .MDL | Symbian OS MIME Type Library |
| .MDL | Quake Model File |
| .MDL | Rational Rose Object Design Model (IBM) |
| .MDL | 3D GameStudio Model Entity (Conitec Datasystems, Inc) |
| .MDL | Simulink Simulation Model (The MathWorks, Inc.) |
| .MDL | Mighty Draw DOS Library (theliquidateher Software, An MCS Investments, Inc. Company) |
| .MDL | RapidForm Proprietary Format (INUS Technology, Inc.) |
| .MDL | MapShots Software |
| .MDL | Half-life Model |
| .MDL | Digitrakker Music Module |
| .MDL | CA-Compete! Spreadsheet |
| .MDL | Animation:Master 3D Model (Hash) |
| .MDL | Flight Simulator 3D Model File (Microsoft Corporation) |
| .MDL | Steam Source SDK Model Content File (Valve Corporation) |
| .MDL | 3D Design Plus Model |
| .MDL | ASTi Model Builder |
| .MDM | Telix Modem Definition |
| .MDM | Mario Dash Map File |
| .MDM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MDMP | WinXP Trouble Report (Microsoft Corporation) |
| .MDN | Access Blank Database Template (Microsoft Corporation) |
| .MDO | Internet Information Server Configuration Backup (Microsoft Corporation) |
| .MDO | Alcohol 120% Split Image File (Alcohol Software) |
| .MDP | Visual C++ MAK File and Visual J++ Project Workspace (Microsoft Corporation) |
| .MDP | Developer Studio Project (Microsoft Corporation) |
| .MDP | Visual Studio .NET Project Converter (VC 4.x) (Microsoft Corporation) |
| .MDP | MicroDesign Page File (Creative Technology) |
| .MDPR | Multi-Channel Server (MCS) Device Policy Editor Device Profile Repository (Volantis Systems Ltd.) |
| .MDR | MagicDraw UML Project (No Magic, Inc.) |
| .MDR | MAX II Recovery File (Max B.V.) |
| .MDR | ZX Spectrum-Emulator Microdrive File |
| .MDR | FaxTalk Modem Doctor Modem Report File |
| .MDS | Directx Mid2stream File |
| .MDS | Media Descriptor CD Image File |
| .MDS | SeeYou Raster Map (Naviter) |
| .MDT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MDT | Access Add-in Data (Microsoft Corporation) |
| .MDT | NOVA NT-MDT Scanning Probe Microscope Data (NT-MDT) |
| .MDT | Ilink Incremental Linker Data Table (Microsoft Corporation) |
| .MDV | QLAY MDV Image |
| .MDV | M1 Pattern File (H. Stoll GmbH & Co.) |
| .MDW | Access Workgroup Information (Microsoft Corporation) |
| .MDX | MDict Dictionary File (Octopus Studio) |
| .MDX | MidiEx MIDI System Exclusive Dump |
| .MDX | Label Pro Re-Index (Avery) |
| .MDX | dBASE IV Multiple Index |
| .MDX | Rational XDE Model (IBM) |
| .MDX | Borland Database Engine Index (Borland Software Corporation) |
| .MDYV | Multi-Channel Server (MCS) Component Policy Editor Dynamic Visual Component (Volantis Systems Ltd.) |
| .MDZ | Protracker/Module File |
| .MDZ | Cubic Player/Cross-View Music Module Description |
| .MDZ | Access Wizard Template (Microsoft Corporation) |
| .MD_ | Visc15 Adressen Setup File |
| .ME | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .me | Nroff Formatted Manual Page with ME Macros |
| .ME | Information |
| .ME | MultiEdit Configuration (Multi Edit Software Incorporated) |
| .ME! | Text (Generally a README File) |
| .ME1 | Zortech 21 Sample Winexam File |
| .ME2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ME3 | Multimedia Email Message (ArcSoft, Inc.) |
| .MEA | Mastersizer 2000 Sample Analysis/Measurement (Malvern Instruments Ltd) |
| .MEA | Meazure File |
| .MEANT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEB | Open eBook (International Digital Publishing Forum) |
| .MEB | WordPerfect Macro Editor Bottom Overflow File (Corel Corporation) |
| .MEC | Maximus MECCA Source |
| .MED | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MED | Medline Document |
| .MED | Notes 5 Medical Dictionary File (IBM) |
| .MED | A2B Player Purchase (DigitalPhono.com) |
| .MED | MOBILedit! Phone Information (COMPELSON Laboratories) |
| .MED | WordPerfect Macro Editor Delete Save (Corel Corporation) |
| .MED | Amiga MED/OctaMED Tracker Module Sound File |
| .MEDIACONTROL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEDIACTRL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEDIAONEPROJECT | MediaOne Project (Corel Corporation) |
| .MEDICAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEDIU | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEDLINE | Medline Document |
| .MEEP | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEF | MAIET Encrypted File System (MAIET entertainment, Inc.) |
| .MEF | Jaws PDF Server Exported Settings (Global Graphics Software Ltd.) |
| .MEFP | ExerciseRT Sample Data Record (Morgan Medical Ltd.) |
| .MEFS | ExerciseRT Secondary Data Record (Morgan Medical Ltd.) |
| .MEG | MEG 101 B Database File (MEGBase) |
| .MEGABLASTER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEGAMISQUE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEI | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEK | Gearhead Garage Game File (Mekada) |
| .MEL | Ericsson Phone Melody |
| .MEL | Maya Embedded Language Script (Alias Systems, a division of Silicon Graphics Limited) |
| .MELL | Mellel Document (RedleX) |
| .MEM | BPM Studio Saved Files for Sampler Functions (ALCATech) |
| .MEM | Clarion DOS Database Memo File (SoftVelocity) |
| .MEM | Medlin Accounting Additional Vendor Data (Medlin Accounting) |
| .MEM | PDP-10 Memo |
| .MEM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEM | Mio Technology Mio Object (Mioplanet Technologies, Inc.) |
| .MEM | WordPerfect Macro Editor Macro (Corel Corporation) |
| .MEM | Memory File of Variables |
| .MEM | FoxPro Memory Variable Save File (Microsoft Corporation) |
| .MEM | Context4 File |
| .MEM | Fanuc Parameter File (FANUC Robotics America, Inc.) |
| .MEMB | Pro/ENGINEER Temporary File (PTC) |
| .MEMBERS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEMO | Unknown Found in Multiple GNU/Linux Packages |
| .MEMORY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEN | Menu |
| .MEN | Geometry II Plus Utility (Cabrilog) |
| .MEN | MenuPro Menu Design (SoftCafe) |
| .MENTAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MENU | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MENU1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MENU2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MENUS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MEP | Inor MePro Software File |
| .MEQ | WordPerfect Macro Editor Print Queue (Corel Corporation) |
| .MER | Entity-Relationship (ER) Diagram |
| .MER | Data Interchange Format |
| .MER | WordPerfect Macro Editor Resident Area (Corel Corporation) |
| .MERLIN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MERMACK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MERR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MERRITT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MES | A2B Player File (DigitalPhono.com) |
| .MES | SpectraMagic Data File (Konica Minolta Holdings, Inc.) |
| .MES | Message File |
| .MES | WordPerfect Macro Editor Work Space (Corel Corporation) |
| .MESA | Opengl Glut-3.6 File |
| .MESHWORLD | Hamsterball Level File (Raptisoft, LLC) |
| .MESSAGE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MESSAGES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MESSENGER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MET | Hydrologic Modeling System (HEC-HMS) Metereologic Model Configuration (U.S. Army Corps of Engineers) |
| .MET | eDonkey Cached Information (MetaMachine) |
| .MET | WordPerfect Macro Editor Top Overflow File (Corel Corporation) |
| .MET | Presentation Manager Meta File |
| .MET | ActiveSky Export File (HiFi Simulation Software) |
| .MET | eMule Cached Information (eMule Team) |
| .MET | OmniPage Document (Nuance Communications, Inc.) |
| .MET | OS/2 PM Meta File |
| .META | Black & White Creature Mind Meta Data (Microsoft Corporation) |
| .METAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .METALFONT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .METALINK | Metalink File (Anthony Bryan) |
| .METHODS | Likely a Text File |
| .MEU | DOS Shell Menus |
| .MEW | MultiEdit Configuration (Multi Edit Software Incorporated) |
| .MEX | MATLAB Executable Command (The MathWorks, Inc.) |
| .MEX | MATLAB Macintosh Dynamically Linked Subroutines (The MathWorks, Inc.) |
| .MEX | mexReader Multimedia File |
| .MEX | Macro Express Macro (Insight Software Solutions) |
| .MEX | WordPerfect Macro Editor Expound File (Corel Corporation) |
| .MEX4 | MATLAB Sun-4/SPARC Dynamically Linked Subroutines (The MathWorks, Inc.) |
| .MEXDS | MATLAB DECStation Dynamically Linked Subroutines (The MathWorks, Inc.) |
| .MEXHP3 | MATLAB HP9000/Series 300 Dynamically Linked Subroutines (The MathWorks, Inc.) |
| .MEXHP7 | MATLAB HP9000/Series 700 Dynamically Linked Subroutines (The MathWorks, Inc.) |
| .MEXN | MATLAB NeXT Dynamically Linked Subroutines (The MathWorks, Inc.) |
| .MEXRS6 | MATLAB IBM RS/6000 Dynamically Linked Subroutines (The MathWorks, Inc.) |
| .MEXSG | MATLAB SGI Dynamically Linked Subroutines (The MathWorks, Inc.) |
| .MEY | Notes 5 Full Text Index (IBM) |
| .MEZ | MusicEase Music Notation File (MusicEase Software) |
| .MEZ | RealArcade Game Information |
| .MF | Java Manifest (Sun Microsystems, Inc.) |
| .mf | METAFONT Font Description File |
| .MF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MF | Manifest Graphic |
| .MF | FrameMaker MakerFile (Adobe Systems Incorporated) |
| .MF | MoonFish Track File (Bram Bos) |
| .MF2 | Authorware Mediator5 Multimedia File (Adobe Systems Incorporated) |
| .MFA | Site Server 3.0 Report Definition (Microsoft Corporation) |
| .MFA | The Games Factory Multimedia Fusion File (Clickteam) |
| .MFASL | Mozilla (Netscape) XUL FastLoad File (Mozilla.org) |
| .MFC | Mankind File |
| .MFD | ABC Programming Language Monadic Function |
| .MFD | Adobe Multiple Master Font Metrics Directory File (Adobe Systems Incorporated) |
| .MFD | Multiframe Structural Frame Model (Formation Design Systems Pty Ltd) |
| .MFD | F1RC Relay Game Code File |
| .MFF | MIDI File Format |
| .MFG | MediaForge Runtime Player Distribution Project (XMLAuthor, Inc.) |
| .MFI | Win98rk File |
| .MFJ | MetaFont Job Batch Input |
| .MFK | Mafuka Audio |
| .MFL | Mozilla (Netscape) XUL FastLoad File (Mozilla) |
| .MFM | VTeX Multiple Master Font Metrics |
| .MFM | mTropolis mPire Interactive Multimedia Title (Quark) |
| .MFM | DMP Music Format |
| .MFMOD | Mobile Forces Game MOD (Rage Software) |
| .MFO | MediaFace Online Saved File (Neato, Inc.) |
| .MFS | MetFS Partition (EnderUNIX) |
| .MFT | MetaFont Source Formatter Style File |
| .MFW | mTropolis mPire Interactive Multimedia Title (Quark) |
| .MFW | Mamiya Camera RAW File (Mamiya) |
| .MFX | mTropolis mPire Interactive Multimedia Title (Quark) |
| .MG | Modula-3 Generic Module Source |
| .MG1 | MusiGenesis Project File (Kenneth Adams) |
| .MGA | Migrys IMR Call Flow (Migrys Innovations) |
| .MGC | Equation Editor File (MGCSoft) |
| .MGC | Clipart Collection Catalog (Microsoft Corporation) |
| .MGCF | MagicInstall Compressed File |
| .MGD | Master Grade Gradebook |
| .MGD | Mungyodance Data Pack (Empathetic Enteprises) |
| .MGF | Micrografx Font |
| .MGF | Monarch Graphic File |
| .MGF | Materials and Geometry Format File |
| .MGF | MalieGF Bitmap |
| .MGF | DataModeler XML Schema Project Data (URL Integration, Inc.) |
| .MGK | ImageMagick Ver. 5.3.2 Coders File (ImageMagick Studio LLC) |
| .MGL | mosascii m2 and MosASCII Graphics Library (Robert DeFusco) |
| .MGL | Age of Kings (Microsoft Corporation) |
| .MGM | MGCSoft Equation Editor Macro File |
| .MGMAP | Ygnius MindGenius Mind Map (Ygnius) |
| .MGMF | MindGenius Mind Map (MindGenius Ltd.) |
| .MGN | Modern Genealogy Genealogy Database (Modern Genealogy, LLC) |
| .mgp | MagicPoint File |
| .MGR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MGR | MGR Bitmap |
| .MGRP | Multi-Channel Server (MCS) Component Policy Editor Asset Group (Volantis Systems Ltd.) |
| .MGS | Intelligence Tracking System File |
| .MGTPL | Ygnius MindGenius Template (Ygnius) |
| .MGU | Band-in-a-Box MIDI File (PG Music, Inc.) |
| .MGV | Yamaha Mega Voices (Yamaha Corporation of America) |
| .MGX | Rise of Nations Saved Game (Microsoft Corporation) |
| .MGX | Micrografx Picture Publisher Clipart |
| .MGZ | Metal Gear Solid Archive |
| .MH | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MH | Graphic File |
| .MHF | Maestro ERP Hot Fix (Maestro Technologies Inc.) |
| .MHG | Multimedia File |
| .MHK | Riven Movie Data File |
| .MHK | Broderbund Mohawk Archive |
| .MHP | Home Publishing Project (Microsoft Corporation) |
| .MHT | MHTML Document (Microsoft Corporation) |
| .MHTENX | egis Encrypted HTM File (HiTRUST Inc.) |
| .MHTM | MHTML Document (Microsoft Corporation) |
| .MHTML | MHTML Document (Microsoft Corporation) |
| .MHTMLENX | egis Encrypted MHTML File (HiTRUST Inc.) |
| .MI | Winamp3 MAKI Scripting Library |
| .MI | Miscellaneous |
| .MI | CoCreate CAD File |
| .MI | mental ray Scene File (mental images GmbH) |
| .MI4 | HDD 100/120 Audio Jukebox Firmware File (Koninklijke Philips Electronics N.V.) |
| .MIA | Babya bMix/Logic Music Project File (Babya Software Group) |
| .MIA | MusicIndiaOnline Trident Player Music File (MusicIndiaOnLine) |
| .MIB | SNMP MIB File |
| .MIB | Management Information Base File |
| .MIB | MyInfo Topic File Backup (Milenix Software Ltd.) |
| .MIBFONT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MIC | PDP-10 Macro Interpreted Commands |
| .MIC | Image Composer File (Microsoft Corporation) |
| .MICE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MID | MapInfo Interchange Format (MapInfo Corporation) |
| .MID | Musical Instrument Digital Interface MIDI-sequention Sound |
| .MIDI | Musical Instrument Digital Interface MIDI-sequention Sound |
| .MIDIFILE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MIDISYNTH | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MIDNAM | Pro Tools MIDI Patch Name File (Avid Technology, Inc.) |
| .MIF | ImageMagick Machine Independent File Format Bitmap (ImageMagick Studio LLC) |
| .MIF | Software License Tracking Tool |
| .MIF | Management Information Format (Distributed Management Task Force, Inc.) |
| .MIF | Watcom Make Script |
| .MIF | MapInfo Interchange Format File (MapInfo Corporation) |
| .MIF | EarthLink E-mail Message Index (EarthLink, Inc.) |
| .MIF | Systems Management Server (SMS) Management Information Format (Microsoft Corporation) |
| .MIF | FrameMaker Interchange Format (Adobe Systems Incorporated) |
| .MIF | Molecular Information Format |
| .MIF | MicroHof .MIF Assembler File |
| .MIF | MIDI Instrument |
| .MIFF | ImageMagick Machine Independent File Format Bitmap (ImageMagick Studio LLC) |
| .MIG | Mighty Draw Drawing (theliquidateher Software, An MCS Investments, Inc. Company) |
| .MII | PageWiz Image (Microtek) |
| .MII | Wii Avatar File (Nintendo) |
| .MII | MicroStat II Data File |
| .MIL | Micro Illustrator Uncompressed Graphic |
| .MIL | Group 4 Fax File |
| .MILK | MilkDrop Winamp Visualization Plug-in Preset File (Nullsoft, Inc.) |
| .MIM | Multi-Purpose Internet Mail Extensions (MIME) File |
| .MIME | Multi-Purpose Internet Mail Extensions (MIME) File |
| .MIMG | Multi-Channel Server (MCS) Component Policy Editor Image Component (Volantis Systems Ltd.) |
| .MIN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MINDTEASER1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MINESWEEPERSAVE-MS | Minesweeper Saved Game (Microsoft Corporation) |
| .MINGW | Mingw Make File |
| .MINGW32 | Mingw Compiler File |
| .MINI | miniControl Data File (LucaNet) |
| .MINIPSF | Playstation Sound Format (Miniature Playstation Sound Format) (Sony Corporation of America) |
| .MINIPSF2 | Playstation 2 Sound Format (Miniature Playstation Sound Format) (Sony) |
| .MINIUSF | Nintendo Ultra 64 Sound Format (Nintendo) |
| .MINT | Linux Mint mintInstall Software Installation File |
| .MIO | mexReader Multimedia File |
| .MIO | Iphoto4 Programs Fio File |
| .MIO | MyInfo Topic File (Milenix Software) |
| .MIO | MIO Compressed Audio |
| .MIO | Mio Technology Generic Communications Format (Mioplanet Technologies, Inc.) |
| .MIP | MODDE Project (Umetrics AB) |
| .MIP | Paint Shop Pro Multiple Image Print File (Corel Corporation) |
| .MIPSEL | Mips File |
| .MIR | Mirage Project File (TVPaint Developpement) |
| .MIS | 3WayPack Missing Data Pointers (The Three-Mode Company) |
| .MIS | Tribes 2 Game File (Sierra) |
| .MIS | Game Mission File |
| .MIS | Delta Force Land Warrior Mission (NovaLogic, Inc.) |
| .MIS | MagicInstall Installation Script |
| .MIS | Tom Clancey's Ghost Recon Mission File (Red Storm Entertainment) |
| .MISC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MISCTOOL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MISS | Homeworld Missle Data (Sierra Entertainment, Inc.) |
| .MISTRALLOGO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MISTY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MITSU | Mitsubishi S340-10 Color Sublimation Printer Bitmap (Mitsubishi Companies) |
| .MIX | PhotoDraw 2000 Multilayer Picture File (Microsoft Corporation) |
| .MIX | Project Dogwaffle Type 2 Mixing Palette (TheBest3D.com) |
| .MIX | Command & Conquer Picture/Sound File (Westwood Studios) |
| .MIX | Don Knuth's MIX Emulator |
| .MIX | Power C Object File |
| .MIX | Techno eJay Music Mix File |
| .MIX | Windows Sound MIX (Microsoft Corporation) |
| .MIX | OzWin CompuServe E-mail/Forum Access Index File |
| .MIX | Picture It! Multilayer Picture File (Microsoft Corporation) |
| .MIZ | Winamp Compressed MIDI File |
| .MJ | MovieJack DVD Ripper File |
| .MJB | PDA Mystery Juke Box Generation Profile (Paul Duggan - PDAWare) |
| .MJF | Mjuice Secure Music Files |
| .MJP | VTech MJP Video |
| .MJP | Media Jukebox |
| .MJP | Media Center Plug-in (J. River, Inc.) |
| .MJPG | SMJPEG Video |
| .MJR | Media Jukebox Registration File (J. River) |
| .MJS | 7400 Costing Database File (Mijas Software) |
| .MK | Make File |
| .MK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MKA | Matroska Audio Stream (Matroska Association) |
| .MKD | Malz++Kassner CAD5 Drawing |
| .MKE | Make File |
| .MKEXT | OS X Mach Kernel Extension File (Apple Inc.) |
| .MKG | Make File |
| .MKH | WinMark Pro Mark File (Synrad, Inc.) |
| .MKI | MediaKnife Animated Internet Picture |
| .MKI | MagView Japanese Makichan Format Graphic |
| .MKI | Picture File |
| .MKJ | MKJamz |
| .MKL | Malz++Kassner CAD5 Drawing Library |
| .MKM | Matroska Media File (Matroska Association) |
| .MKR | McCullough Knowledge Explorer Knowledge Representation (Richard H. McCullough, Knowledge Engineer) |
| .MKR | Train Simulator Marker File (Microsoft Corporation) |
| .MKR | Tonline Bsw4 Internet File |
| .MKS | Tact Data |
| .MKS | Sierra Mastercook Cookbook File |
| .MKS | Matroska Subtitles Stream (Matroska Association) |
| .MKTS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MKV | Matroska Video Stream (Matroska Association) |
| .MKW | Compressed Audio File (Michael K. Weise) |
| .MKZ | PokerOffice Backed Up Database (PokerOffice.com) |
| .ML | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .ML | ML language Source Code File |
| .ML | Camomile Configuration/Module File |
| .ML | F# Source Code (Microsoft Corporation) |
| .ML0 | MultiLedger Company Information (CheckMark Software, Inc.) |
| .ML1 | MultiLedger Balance (CheckMark Software, Inc.) |
| .ML2 | Tripos MOL2 Molecule File |
| .ML2 | Mein Leben II Personal Profile (Appadaumen Productions) |
| .ML2 | MultiLedger Budget (CheckMark Software, Inc.) |
| .ML20 | MSN Webcam Recorder Video File |
| .ML256 | MessageLock Encrypted Message (Encryptomatic LLC) |
| .ML3 | MultiLedger Chart of Accounts (CheckMark Software, Inc.) |
| .ML3 | Milestones 3.x Schedule (KIDASA Software, Inc.) |
| .ML4 | Milestones ver 4.0 and 4.5 Schedule (KIDASA Software, Inc.) |
| .ML4 | MultiLedger Customers (CheckMark Software, Inc.) |
| .ML5 | Milestones ver 5.0 and 5.01 Schedule (KIDASA Software, Inc.) |
| .ML5 | MultiLedger Vendors (CheckMark Software, Inc.) |
| .ML6 | MultiLedger Items (CheckMark Software, Inc.) |
| .ML6 | PowerPoint Milestone File (Microsoft Corporation) |
| .ML6 | Milestones Professional 2000 Schedule (KIDASA Software, Inc.) |
| .ML7 | Milestones Professional 2002 Schedule (KIDASA Software, Inc.) |
| .ML7 | MultiLedger Salesperson (CheckMark Software, Inc.) |
| .ML8 | Milestones Professional 2004 Schedule (KIDASA Software, Inc.) |
| .ML8 | MultiLedger Job (CheckMark Software, Inc.) |
| .ML9 | Milestones Professional 2004U Schedule (KIDASA Software, Inc.) |
| .ML9 | MultiLedger Transactions (CheckMark Software, Inc.) |
| .MLA | Milestones Professional 2006 Schedule (KIDASA Software, Inc.) |
| .MLB | FoxPro for Macintosh Library |
| .MLB | Symphony Macro Library File |
| .MLB | MyLittleBase Database |
| .MLB | OpenVAX Macro Library |
| .MLB | MultiLedger Ship Via (CheckMark Software, Inc.) |
| .MLB | Peachtext List Manager (Peachtree Software (Sage Software SB, Inc.)) |
| .MLC | MultiLedger Ship To (CheckMark Software, Inc.) |
| .MLC | Windows Vista Language Interface Pack (Microsoft Corporation) |
| .MLC | mAirList Cart Set (Torben Weibert) |
| .MLD | Multilizer Dictionary |
| .MLD | mAirList Desktop (Torben Weibert) |
| .MLD | Van Dorn Plastic Injection Molding Machine Saved Process |
| .MLD | MyLabel Designer Deluxe Label File (Avanquest Publishing USA, Inc.) |
| .MLD | Polyphonic Ringtone File for Phones |
| .MLD | MultiLedger Index (CheckMark Software, Inc.) |
| .MLE | mAirList Event List (Torben Weibert) |
| .MLF | UpdateEXPERT Machine List File (St. Bernard Software) |
| .MLI | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MLI | F# Source Code (Microsoft Corporation) |
| .MLI | AutoCAD Material-Library File (Autodesk, Inc.) |
| .MLI | Encyclopedia Media List |
| .MLI | Camomile Individual Module File |
| .MLI | 3D Studio Material-Library File (Autodesk, Inc.) |
| .MLINEFONT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MLK | Sierra Mastercook Look File |
| .MLM | Novel Groupwise E-mail File |
| .MLN | AutoCAD Multiline Definition (Autodesk, Inc.) |
| .MLNK | Multi-Channel Server (MCS) Component Policy Editor Link Component (Volantis Systems Ltd.) |
| .MLP | Meridian Lossless Packing Audio File (Meridian Audio) |
| .MLP | mAirList Playlist (Torben Weibert) |
| .MLS | mAirList Script (Torben Weibert) |
| .MLS | Milestones 1.x and 2.x Schedule and Simplicity (all ver) (KIDASA Software, Inc.) |
| .MLS | Skype Localization Data (Skype Technologies S.A.) |
| .MLS | Miles Sound Tools Compressed DLS |
| .MLT | Forecast Pro Multivariate Forecast File (Business Forecast Systems, Inc.) |
| .MLT | mAirList Desktop Template (Torben Weibert) |
| .MLTV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MLYT | Multi-Channel Server (MCS) Layout Policy Editor Layout Policy (Volantis Systems Ltd.) |
| .ML_ | Mainlog Compressed Mud Log (Mailog) |
| .MM | Xcode Core C Program (Apple Inc.) |
| .MM | Multimate Advantage File |
| .MM | Macro Mania Macro |
| .MM | FreeMind Mind Map |
| .mm | groff Source in mm Format |
| .MM | Meme Virtual Reality World (Immersive Systems Inc.) |
| .MM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MM | Lightscape Material Map |
| .MM | Metamath ASCII Database (Norman Megill) |
| .MM | Rise of Nations Campaign Media File (Microsoft Corporation) |
| .MM3 | Mortgage Minder Ver. 3 Saved Mortgage Configuration File (CW Technical Services) |
| .MM4 | Mortgage Minder Ver. 4 Saved Mortgage Configuration File (CW Technical Services) |
| .MM5 | Makromat Macroeconomic Model Data (University of Muenster, Germany) |
| .MMA | Grlib Cppima Scilimag File |
| .MMA | Master Album Maker Album File (Intrepid Mouse Limited) |
| .MMAP | MindManager Brainstorm and Process Control Map (Mindjet) |
| .MMB | Oracle Forms Menu Binary Source Code |
| .MMB | MultiMedia Builder |
| .MMBK | MannaBook (MannaBook Software, Inc.) |
| .MMBK | My Money Vista Database Backup File (ZPSSoft) |
| .MMBM | MannaBook (MannaBook Software, Inc.) |
| .MMC | Clipart DLLbackup Autoshape File (Microsoft Corporation) |
| .MMC | Media Catalog |
| .MMC | Office Media Content |
| .MMC | MicroCase Boundary File (Cengage Learning) |
| .MMD | DocsAlive Multimedia Document (Softedge-Systems Ltd) |
| .MMD | Nigarva Downloader Download List File (K&A Corporation) |
| .MMD | Media Processing Server Studio Data (Nortel Networks) |
| .MMD | MangoData Multi-User Database (MightyMango) |
| .MMD | mAirList Metadata (Torben Weibert) |
| .MMD | Cumulate Draw Editable MMD Format (Cumulate Labs) |
| .MMD | MacroModel Molecular Mechanics File (Columbia University Chemistry) |
| .MMD | Summit Membership Manager Database (MIE Software Pty Ltd) |
| .MME | Multi-Purpose Internet Mail Extensions (MIME) File |
| .MMF | AppMind Message Management File (Appmind Software AB) |
| .MMF | Mail File (Microsoft Corporation) |
| .MMF | MathMagic Equation File (InfoLogic, Inc.) |
| .MMF | Meal Master Format |
| .MMF | Media Processing Server Studio Reference Name (Nortel Networks) |
| .MMF | McAfee VirusScan Configuration (Networks Associates Technology, Inc.) |
| .MMF | Yamaha SMAF Synthetic Music Mobile Application Format (Yamaha Corporation of America) |
| .MMG | mkvmerge GUI Saved Muxing Settings (Moritz Bunkus) |
| .MMH | MS Media Manager Helper DLL |
| .MMI | Memo Open Client |
| .MMI | Media Processing Server Studio Index (Nortel Networks) |
| .MMJB_MIME | MusicMatch Jukebox MIME ID File (MUSICMATCH, Inc.) |
| .MML | Aleph One Marathon Markup Language (Marathon Open Source) |
| .MML | MathML Math Embedded HTML File |
| .MML | MolMol Molecule Description File |
| .MML | MySoftware or ProVenture MailList Program Mail List (Elibrium, LLC) |
| .MML | Mail Meta Language |
| .MML | FrameMaker (Adobe Systems Incorporated) |
| .MMLD | EdGCM Data File (The EdGCM Cooperative Project of Columbia University) |
| .MMM | Multimedia Movie (Microsoft Corporation) |
| .MMM | MacroMind Directory RIFF/RMMP Format Movie |
| .MMM | Multiple Master Font File (Adobe Systems Incorporated) |
| .MMO | Hyper File Memo (PC SOFT) |
| .MMO | Musicmatch On Demand Playlist (Musicmatch, Inc.) |
| .MMO | Memory-Map Navigator Overlay (Memory-Map, Inc.) |
| .MMO | RapidFile Memo Writer |
| .MMOD | MacroModel Molecular Mechanics File (Columbia University Chemistry) |
| .MMP | Gammadyne Mailer Project File |
| .MMP | EPOC Makmake Makefile Project |
| .MMP | Multimedia Player Movie Clip |
| .MMP | MixMeister Playlist (MixMeister Technology) |
| .MMP | MicroMedia Playlist (Demonic Software) |
| .MMP | MS Music Producer |
| .MMP | Grand Theft Auto Multiplayer Map File (Rockstar Games) |
| .MMP | CoCo Systems VisiMap |
| .MMP | Master Album Maker Album Project File (Intrepid Mouse Limited) |
| .MMP | Bravado Board Output Video Format |
| .MMP | MindManager Map File (Mindjet) |
| .MMP | Bravado Board Video Output Format |
| .MMPBT | MindManager Branch Template File |
| .MMPT | MindManager Template |
| .MMR | LOKI Character Template (Synthetic Realms) |
| .MMS | JPEG-6b File |
| .MMS | Miles Sound Tools |
| .MMS | NT MidiMagic Song Information (NovaTech Design) |
| .MMS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MMSCRIPT | MindManager Script File |
| .MMT | Nimbus 7 SAMS Data File |
| .MMT | egseing Memory Dump Data |
| .MMT | CoCo Systems VisiMap |
| .MMV | Sony MovieShaker File |
| .MMV | Dega Movie Capture Format |
| .MMW | Multimedia World Magazine |
| .MMW | AceMoney Financial Data (MechCAD Software LLC) |
| .MMW | Media Content |
| .MMX | Oracle Forms Compiled Menu |
| .MMX | MarkMagic Import/Export |
| .MMX | Command & Conquer Red Alert 2 Map File (Westwood Studios) |
| .MMZ | MusicMatch Theme File (MUSICMATCH, Inc.) |
| .MN1 | Money Ver 1 Data File (Microsoft Corporation) |
| .MN2 | Descent2 Mission File |
| .MN2 | Money Ver 2 Data File (Microsoft Corporation) |
| .MN3 | Descent 3 |
| .MN3 | Money Ver 3 Data File (Microsoft Corporation) |
| .MN3 | Descent3 Mission File |
| .MN4 | Money Database (Microsoft Corporation) |
| .MN4 | Money Ver 4 Data File (Microsoft Corporation) |
| .MN5 | Money Ver 5 Data File (Microsoft Corporation) |
| .MN6 | Money Ver 6 Data File (Microsoft Corporation) |
| .MN7 | Money Ver 7 Data File (Microsoft Corporation) |
| .MN8 | Money Ver 8 Data File (Microsoft Corporation) |
| .MN9 | Money Ver 9 Data File (Microsoft Corporation) |
| .MNB | MuPAD File |
| .MNC | My Notes Center File |
| .MNC | AutoCAD Compiled Menu (Autodesk, Inc.) |
| .MND | MusicNet Music Download (MusicNet) |
| .MND | AutoCAD Menu Program (Autodesk, Inc.) |
| .MND | Fractal Forge Ver. 2.x Fractal Parameters |
| .MND | Cerious Mandelbrot Image |
| .MND | MNI Mandelbrot for Windows |
| .MNF | Saved MSN Search |
| .MNG | Keyboard File Manager MIDI/MID Files Floppy Database (Yahama) |
| .MNG | Multi-image Network Graphic Animation |
| .MNG | DeLorme Map'n'Go Map |
| .MNG | Animation Shop Animation (Corel Corporation) |
| .MNI | Cerious Mandelbrot Image |
| .MNL | Zortech 3 Binary File |
| .MNL | OrCAD Netlist File (Cadence Design Systems, Inc.) |
| .MNL | AutoCAD AutoLISP Functions Related to Menu (Autodesk, Inc.) |
| .MNO | Monopoly Saved Game |
| .MNO | Macromedia Design Notes |
| .MNPF | NoteStar v1.2a + Graphic (Jayden Carr) |
| .MNR | AutoCAD Compiled Menu (Autodesk, Inc.) |
| .MNR | IBM Voice Type Language Newuser File |
| .MNS | AutoCAD ASCII Menu (Autodesk, Inc.) |
| .MNT | Foxpro Menu Memo (Microsoft Corporation) |
| .MNU | AutoCAD Menu Template (Autodesk, Inc.) |
| .MNU | HP NewWave Advanced Macro |
| .MNU | FoxPro Menu |
| .MNU | RadASM Menu File (KetilO) |
| .MNU | Menu File |
| .MNU | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MNW | Menu File |
| .MNX | Foxpro Menu (Microsoft Corporation) |
| .MNX | AutoCAD Compiled Menu (Autodesk, Inc.) |
| .MNY | Money Data File (Microsoft Corporation) |
| .MO | GNU Gettext Machine Object File (Free Software Foundation) |
| .MO | Dymola Simulation |
| .mo | Message Catalog Binary File |
| .MO | Modula-3 Object File |
| .MO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MO1 | Odyssey Disk/ROM Image |
| .MO3 | MO3 MOD Audio Format (un4seen developments) |
| .MOB | Master of Orion 3 |
| .MOB | Device Definitions |
| .MOBAPP | MOBILedit! Application (COMPELSON Laboratories) |
| .MOBDRV | MOBILedit! Driver (COMPELSON Laboratories) |
| .MOBI | Mobipocket eBook Format (Amazon.com, Inc.) |
| .MOBSKIN | MOBILedit! Skin (COMPELSON Laboratories) |
| .MOC | QT Meta-Object Compiler Header Files (Trolltech) |
| .MOC | MOCHA Javascript |
| .MOCHA | MOCHA Javascript |
| .MOD | Peachtext Database (Peachtree Software (Sage Software SB, Inc.)) |
| .MOD | Model File |
| .MOD | Connectivity Memory Model Cell Specific Plasticity Functions on Incoming Synapses Input File |
| .MOD | Music File |
| .MOD | Music Module |
| .MOD | Clarion for Modula-2 Source Code File (SoftVelocity) |
| .MOD | Femap (UGS Corp.) |
| .MOD | ProModel Optimization Software Suite Model |
| .MOD | Windows Kernel Module |
| .MOD | PDP-10 MODULA-II Compiler Source |
| .MOD | Multiplan Spreadsheet |
| .MOD | Multiplan Spreadsheet (Microsoft Corporation) |
| .MOD | EPOC Model Definition |
| .MOD | JVC Everio Digital Video File (JVC Americas Corp) |
| .MOD | CADdy++ Mechanical 2D/3D Model Data (DataSolid GmbH) |
| .MOD | WinBoard Import Module (Ivex Design International) |
| .MOD | File Implementing DOS Support for Windows DLL's |
| .MOD | Modula-2 Program File |
| .MOD | Digital Music Sound Clip |
| .MOD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOD | Monarch Model (Datawatch Corporation) |
| .MOD | Module |
| .MOD | PHP Source Code |
| .MOD | Amiga and PC Tracker Module |
| .MODD | Picture Motion Browser Data (Sony Corporation of America) |
| .MODEL | Ribbons Molecular Model |
| .MODEL | LEGO CAD Model File (The LEGO Group) |
| .MODEL | PlantWALK Model |
| .MODEL | ActiveModeler Avantage Process Model (KAISHA-Tec Co. Ltd.) |
| .MODEM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODEM1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODEM2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODEM3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODEM4 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODEM5 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODEM6 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODEM7 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODEM8 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODEM9 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODERNTALKING | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODULAE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MODULE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .module | Drupal Module (Dries Buytaert) |
| .MODULES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOF | Systems Management Server (SMS) Managed Object Format (Microsoft Corporation) |
| .MOF | MSinfo (Microsoft Corporation) |
| .MOGG | Ogg Vorbis File Variation |
| .MOHO | Anime Studio Project File (Lost Marble) |
| .MOI | JVC Everio Digital Audio File (JVC Americas Corp) |
| .MOI | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOI | French Text File |
| .MOL | MOdule (play)List |
| .MOL | Easy Palette Object Library |
| .MOL | MDL Molfile Molecule File (MDL Information Systems, Inc.) |
| .MOL2 | WebLab Molecular Viewer File |
| .MOL2 | Portable Representation of a SYBYL Molecule |
| .MOM | SPEFO Stellar Spectra Analysis File |
| .MOM | CDrom Runtime Database File |
| .MOM | Xcode Compiled Core Data-based Data Model (Apple Inc.) |
| .MON | ReadMail Monitor |
| .MON | Virgin Games Monopoly Deluxe |
| .MON | Firefox Bookmark Backup File |
| .MONDAY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MONEY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MONICA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MONO | Monolith Munged Encoded File |
| .MONO | Bi-level Bitmap in Least-Significant-Byte First Order |
| .MONS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MONSTER2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MONTE | CRiSP Harvest File |
| .MOO | QuickTime Movie Clip (Apple Inc.) |
| .MOO | MoonRock Language Source Code File |
| .MOOD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOOD | Amarok Data File |
| .MOON | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOOV | QuickTime Movie (Apple Inc.) |
| .MOP | Mopac Input File |
| .MOP | MDL Molfile MOPAC Input Format (MDL Information Systems, Inc.) |
| .MOP | NS/Elite Display 3.12 Macro Object Path File |
| .MOP | M.Fujimiya's Morpher for Windows 1.4 Work File |
| .MOR | Poser 3D Morph Target File |
| .MOR | Corel Shared Writing Tools 9.0 File |
| .MORE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MORTBATS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOS | Leaf Camera RAW File |
| .MOS | System DOS 6.2 File |
| .MOS | MACAOS Compressed Tranismission File (Elprint AS) |
| .MOS | Dymola Simulation |
| .MOS | Infinity Game Engine Background and GUI Tile Info (BioWare Corp.) |
| .MOS | Infinity Game Engine Compressed Background and GUI Tile Info (BioWare Corp.) |
| .MOT | Sharp cellphone GX Flash File (Sharp) |
| .MOT | Phoneme Translation File |
| .MOT | Linux Load Instructions |
| .MOT | Motorola JADE Ringtone |
| .MOTBIN | Motorola JADE Ringtone |
| .MOTIF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOTIF | Microangelo Motif |
| .MOUNT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOUSE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOUSETEXT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOV | QuickTime Video Clip (Apple Inc.) |
| .MOV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOV | AutoCAD AutoFlix Movie (Autodesk, Inc.) |
| .MOVE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOVEMON | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOVERADDIN | Mover Add-in (Nicodemous Bytes) |
| .MOVERBACKUP | Mover Backup Set (Nicodemous Bytes) |
| .MOVERCONFIG | Mover Configuration (Nicodemous Bytes) |
| .MOVERDB | Mover Database (Nicodemous Bytes) |
| .MOVERREG | Mover Registration Info (Nicodemous Bytes) |
| .MOVERTEMPLATE | Mover Template (Nicodemous Bytes) |
| .MOVES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOVIE | QuickTime Movie (Apple Inc.) |
| .MOVIE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOX | ExtendSim Model File (Imagine That Inc.) |
| .MOZ | Netscape Temp File |
| .MOZART | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MOZEML | Thunderbird Mail Message File (Mozilla Corporation) |
| .MP | Multiplan File |
| .MP | EARS Component File |
| .MP | Maya Personal Learning Edition (Alias Systems, a division of Silicon Graphics Limited) |
| .MP | MetaPost Macro |
| .MP | Monochrome Picture TIFF Bitmap |
| .MP | cGPSmapper Polski Format Mapy -- Polish Map Format (Stanislaw Kozicki) |
| .MP+ | MPEG Plus Audio File |
| .MP1 | MPEG Audio Stream, Layer I |
| .MP2 | MPEG Audio Stream, Layer II |
| .MP2 | Masterpoint Red Points File (ABF Masterpoint Centre) |
| .MP21 | AXMEDIS MPEG-21 File (AxMediaTech S.R.L.) |
| .MP2M | Max Payne 2 Mod File (Rockstar Games) |
| .MP2S | Max Payne 2 Saved Game (Rockstar Games) |
| .MP2S | MPEG-2 Video |
| .MP2V | MPEG Audio Stream, Layer II |
| .MP3 | Masterpoint Green Points File (ABF Masterpoint Centre) |
| .MP3 | mp3PRO Audio File |
| .MP3 | SHARP MZ-series Emulator File |
| .MP3 | AlbumWrap Wrapped Music File Archive (Infamus Software LLC) |
| .MP3 | Wrapster Wrapped File |
| .MP3 | MPEG Audio Stream, Layer III |
| .MP3MAN | MP3Man Playlist (You 2 Software) |
| .MP3PRO | mp3PRO Enhanced MP3 File |
| .MP4 | MPEG-4 Video File |
| .MP4V | MPEG-4 Video File |
| .MP5 | Maple V Release 3 Windows/DOS File (Maplesoft, a Division of Waterloo Maple Inc.) |
| .MP5 | Masterpoint Red and Green Points File (ABF Masterpoint Centre) |
| .MP? | LoseThos Compiler Map File (Terry A. Davis) |
| .MPA | MPEG Audio Stream, Layer I, II or III |
| .MPA | E-Designer (Beijer Electronics) |
| .MPA | Palm Memo File |
| .MPA | BusinessMAP Map Layer File (ESRI) |
| .MPB | TruVideo Video-only MPB Stream |
| .MPB | MyPhoneExplorer Backup File (Franz Josef Wechselberger) |
| .MPB | Maintenance Parts Bin Database (Nhuntsoftware) |
| .MPC | Collectorz.com MP3 Collector MP3 Collection Data (Collectorz.com) |
| .MPC | Musepack Audio File |
| .MPC | VersaPro Compiled Motion Block |
| .MPC | Project Calender (Microsoft Corporation) |
| .MPCB | ReliaSoft MPC 3 |
| .MPCF | MarketPlace Pro Configuration Settings (Claritas) |
| .MPCPL | Media Player Classic Playlist |
| .MPD | My Digital Photos Filmstrip (Super Win Software) |
| .MPD | MapDraw Chemical Sequence Map (Biomolecular Computing Resource (BimCore) at Emory University School of Medicine) |
| .MPD | SCSI MiniPort Driver (Microsoft Corporation) |
| .MPD | File List Creator MP3 Playlist (WenSoftware) |
| .MPD | Project Database File (Microsoft Corporation) |
| .MPD | MLCad LDraw Multipart Model File (LM-Software) |
| .MPD | Windows Mini-port Driver |
| .MPD | ABC Programming Language Monadic Predicate |
| .MPDEX | MPdex MP3 Database Utility |
| .MPE | MPEG Movie Clip |
| .MPE.EXE | MP3 Digital Player Wrapper |
| .MPEG | MPEG 1 System Stream |
| .MPF | MPF Audio File (Mobijet Science & Technology Co., Ltd.) |
| .MPF | MainActor Project (MainConcept AG) |
| .MPF | MosASCII Discontinued Project Workspace File (Robert DeFusco) |
| .MPF | Design Gallery (Microsoft Corporation) |
| .MPFA | FASTA Format DNA and Protein Sequence Alignment |
| .MPG | MPEG Animation |
| .MPG | Salt Lake City Game Movies File |
| .MPG | MPEG 1 System Stream |
| .MPG | ProgDVBR MPEG2 Video File |
| .MPG4 | MPEG-4 Media File |
| .MPGA | Mpeg-1 Layer3 Audio Stream |
| .MPH | Photoline4 Morphing File |
| .MPH | Publisher (Microsoft Corporation) |
| .MPH | COMSOL Multiphysics Model File (COMSOL, Inc.) |
| .MPI | MPlayer Control File |
| .MPI | Links98 Golf Game File |
| .MPJ | MINITAB Project File (Minitab Inc.) |
| .MPJ | STOIK Morph Man Project Information File |
| .MPJ | Sometimes .MP3 File |
| .MPJ | RoboHTML Project |
| .MPJ | Mountain Video Editing File |
| .MPK | Augmented Microsoft-Project (Microsoft Corporation) |
| .MPKG | Meta Package File |
| .MPL | AVCHD Playlist |
| .MPLS | Blu-ray Movie Playlist Information (Blu-ray Disc Association) |
| .MPM | Max Payne MOD Archive (Rockstar Games) |
| .MPM | WordPerfect MathPlan Macro (Corel Corporation) |
| .MPM | MPEG Movie |
| .MPM | MPMOffice Data File (MPMsoft Medical Billing Software) |
| .MPN | mophun Game File (morphun) |
| .MPNT | MacPaint Bitmap File |
| .MPO | Sheffield Dictionary File |
| .MPO | Augmented Microsoft-Project (Microsoft Corporation) |
| .MPP | Project Project (Microsoft Corporation) |
| .MPP | CAD Drawing File |
| .MPP | Zortech 3 README File |
| .MPP | Musepack Audio File |
| .MPP | BX-24 Basic Express Compiler Map |
| .MPQ | Blizzard Game Data File (Blizzard Entertainment) |
| .MPR | AutoCAD Mass Properties Report (Autodesk, Inc.) |
| .MPR | Multilizer Project File (Multilizer, Inc.) |
| .MPR | Westwood Studios Game File |
| .MPR | Visual Foxpro Solution Menus File (Microsoft Corporation) |
| .MPR | FileMaker Spelling Dictionary |
| .MPR | Music Publisher Backup Data File (Braeburn Software) |
| .MPR | MPEG Audio Stream, Layer I, II or III |
| .MPR | Live for Speed Multiple Player Replay |
| .MPS | Pocket Streets Map File (Microsoft Corporation) |
| .MPS | MySweetNix! |
| .MPS | Multimedia File |
| .MPS | MPEG-1 Audio and Video File |
| .MPS | Max Payne Saved Game (Rockstar Games) |
| .MPS | MapSource GPS Mapping Interface Waypoints (Garmin Ltd.) |
| .MPS | Casio PDL Pocket Streets Map (Casio Computer Co., Ltd.) |
| .MPT | Project Template File (Microsoft Corporation) |
| .MPT | Multipage TIFF Bitmap |
| .MPV | Project View (Microsoft Corporation) |
| .MPV | MyPhotoZip File |
| .MPV | MPEG-1 Video File |
| .MPV2 | MPEG Audio Stream, Layer II |
| .MPW | mosascii m2 and MosASCII Project Workspace File (Robert DeFusco) |
| .MPW | Oc2.316s Cakit File |
| .MPX | Project Export File (Microsoft Corporation) |
| .MPX | BX-24 Basic Express Compiler Map |
| .MPX | Alpha Five Temporary Index Information (Alpha Software, Inc.) |
| .MPX | RCA/Lyra Handheld MP3 Player File (RCA) |
| .MPX | Foxpro Compiler Menu (Microsoft Corporation) |
| .MPY | RCA/Lyra Handheld MP3 Player File (RCA) |
| .MPZ | MyPhotoZip File |
| .MPZ | Moove Resource Description File (moove Corporation) |
| .MPZ | SoundSlimmer Compressed MP3 Audio (Sound Genetics Inc.) |
| .MPZ | SignIQ Project (ImpulseLogic) |
| .MQ4 | MetaTrader Indicator (MetaQuotes Software Corp.) |
| .MQC | CP/M Disk Drive Information File |
| .MQD | Malete Query Data (OpenIsis) |
| .MQL | MetaTrader Indicator File (MetaQuotes Software Corp.) |
| .MQP | Multiquence Project |
| .MQV | Sony Movie Player Format (Sony Corporation of America) |
| .MQX | Malete Query Access File (OpenIsis) |
| .MRA | VilagRadio Recorded Radio Program (MAVIP Ltd) |
| .MRB | C++ Multiple Resolution Bitmap Graphic |
| .MRC | MIRC Script File |
| .MRC | Bibliographic Data Format |
| .MRD | SILVERRUN RDM Database Schema File (Grandite) |
| .MRD | Malete Record Data File (OpenIsis) |
| .MRD | Instron Series 9 Test Data File (Illinois Tool Works Inc.) |
| .MRD | Infinity Document (MathRevolt) |
| .MRES | Homeworld (Sierra Entertainment, Inc.) |
| .MRF | MultiEx Commander Resource File (XeNTaX) |
| .MRF | WinMorph Project Information File |
| .MRF | Marks Russel File |
| .MRF | Macintosh Font |
| .MRF | Grade Busters Teacher Tools File |
| .MRF | MeterReading Data (Dataconomy) |
| .MRF | Morpheus Saved Game |
| .MRF | GPS Pathfinder Office Geoid Grid File (Trinble Navigation Limited) |
| .MRG | Merge File |
| .MRG | DESQview (Symantec Corporation) |
| .MRI | MRI Scan |
| .MRIMG | Macrium Reflect Disk Image Backup (Paramount Software UK Ltd) |
| .MRK | Windows 95 User Benchmark |
| .MRK | TAPCIS Marked Messsage Commands |
| .MRK | MissionRisk |
| .MRK | Informative Graphics Markup File |
| .MRK | CSI Markup File |
| .MRK | SleepScan and Ceegraph Stores Technician (User) Comments (Bio-logic Systems Corp.) |
| .MRLV | Multi-Channel Server (MCS) Component Policy Editor Rollover Image Component (Volantis Systems Ltd.) |
| .MRO | SharpEye Music Reader File |
| .MRP | Infinity Solution Plot (MathRevolt) |
| .MRS | WordPerfect Macro Resource File (Corel Corporation) |
| .MRS | Gunz Game Data (MAIET entertainment, Inc.) |
| .MRS | Clone Remover Saved Duplicates List (Moleskinsoft) |
| .MRW | Sony (Minolta) Raw Image File (Sony) |
| .MRX | Malete Record Access File (OpenIsis) |
| .MS | Formatted Manual Page with MS Macros |
| .MS | Maple Worksheet (Maplesoft, a Division of Waterloo Maple Inc.) |
| .MS | 3ds Max Script Source Code (Autodesk, Inc.) |
| .MS | Checksum File for Anti-Virus |
| .MS | Chemstation GC/MS or LC/MS Data (Agilent) |
| .MS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MS | Modula-3 Intermediate Assembly File |
| .MS1 | OzWin CompuServe E-mail/Forum Access Message File |
| .MS3D | MilkShape 3D Model |
| .MS8 | Multisim Design (National Instruments Corporation) |
| .MS9 | Multisim Design (National Instruments Corporation) |
| .MSA | Magic Shadow Archive |
| .MSA | Atari MSA Disk Image (Atari) |
| .MSA | Memory Stick Audio Format (Sony Corporation) |
| .MSBCM | Business Contact Manager Backup Database (Microsoft Corporation) |
| .MSC | CRiSP Harvest File |
| .MSC | eYaMosaic Graphic Mosaic (ESRI China (Beijing)) |
| .MSC | Microsoft Management Console Snap-in Control File (Microsoft Corporation) |
| .MSC | C Makefile |
| .MSC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MSCPC | MaintScape Collection (GrandRavine Software Limited) |
| .MSCR | Multi-Channel Server (MCS) Component Policy Editor Script Component (Volantis Systems Ltd.) |
| .MSD | Maxsurf Design File (Formation Design Systems Pty Ltd.) |
| .MSD | Macro eXpert Macro (GrassSoftware) |
| .MSD | [Unknown] |
| .MSD | Diagnostic Utility Report (Microsoft Corporation) |
| .MSD | Advanced Key and Mouse Recorder Macro (GrassSoftware) |
| .MSD | Multimedia Studio Document (Burton Software) |
| .MSDEV | Msvc Make File |
| .MSDL | Manchester Scene Description Language |
| .MSDVD | Windows DVD Maker Project (Microsoft Corporation) |
| .MSE | Bwsb120a Demo File |
| .MSF | Multiple Sequence File |
| .MSF | Netscape Mail Mail Summary File (Netscape) |
| .MSF | Thunderbird Mail Summary File (Mozilla Corporation) |
| .MSF | EarthLink E-mail Message File (EarthLink, Inc.) |
| .MSG | TAPCIS Captured Messages |
| .MSG | FoxPro FoxDoc Message |
| .MSG | OS/2 Help Message File (IBM) |
| .MSG | Exchange Mail Message (Microsoft Corporation) |
| .MSG | OzWin CompuServe E-mail/Forum Access Message File |
| .MSG | Program Message |
| .MSG | PMMail/2 E-mail Message File (V.O.I.C.E. (Virtual OS/2 International Consumer Education)) |
| .MSG | Pegasus Mail Stored Messages To Be Sent (David Harris) |
| .MSG | PMMail 2000 E-mail Message File (Blueprint Software Works) |
| .MSG1 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MSG2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MSG3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MSH | MASH |
| .MSH | FLUENT Mesh (Fluent Incorporated) |
| .MSH | Orbiter Mesh File (Martin Schweiger) |
| .MSHR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MSI | TruNEST Nesting Data (Magestic Systems, Inc.) |
| .MSI | Cerius2 (Accelrys Software Inc.) |
| .MSI | Windows Installer File (Microsoft Corporation) |
| .MSIF | MyLabel Designer Deluxe Label File (Avanquest Publishing USA, Inc.) |
| .MSK | BMC Software Patrol Icon File |
| .MSK | CARA-Script-Interpreter-Engine Mask |
| .MSK | Paint Shop Pro Mask File (Corel Corporation) |
| .MSK | Animator Mask Format (Autodesk, Inc.) |
| .MSL | MAINSAIL Source Code (XIDAK, Inc.) |
| .MSL | ProWORX Nxt MSL Loadables (Schneider Electric) |
| .MSL | ImageMagick Scripting Language File (ImageMagick Studio LLC) |
| .MSM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MSM | Multisim Circuit Diagram (National Instruments Corporation) |
| .MSM | Windows Installer Merge Module (Microsoft Corporation) |
| .MSN | Microsoft Network Document (Microsoft Corporation) |
| .MSN | Descent Mission File |
| .MSN | MSN Content Plus Installer File (MSN Content Plus Inc.) |
| .MSN | Microsoft Network MSN Central (Microsoft Corporation) |
| .MSN | Network Document |
| .MSNBAK | MSN Mail Backup File (Microsoft Corporation) |
| .MSO | MedlySound Sound/Module |
| .MSO | ActiveMime Object |
| .MSO | Word OLE Web Page Storage Stream (Microsoft Corporation) |
| .MSO | Orgchart File (Microsoft Corporation) |
| .MSO | Math Script Object File |
| .MSO | FrontPage File (Microsoft Corporation) |
| .MSP | Windows Installer Patch (Microsoft Corporation) |
| .MSP | Magix Music Studio File |
| .MSP | Technics Sx KN 5000 Keyboard Manual Sequence Pads File |
| .MSP | Technics Sx KN 6000 Keyboard Performance Pads File |
| .MSP | Paint Bitmap (Microsoft Corporation) |
| .MSPLG | Modem Spy Plug-in File (SoftCab Inc.) |
| .MSPX | XML-based Web Page (Microsoft Corporation) |
| .MSQ | Multimedia Workshop Sound File |
| .MSR | OzWin CompuServe E-mail/Forum Access SYSOP File |
| .MSRCINCIDENT | Windows Remote Assistance Request (Microsoft Corporation) |
| .MSS | MediaShout Presentation Script (MediaComplete) |
| .MSS | Miles XMIDI Sequence with DLS Data |
| .MSS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MSS | Manuscript Text File |
| .MSS | Game Score |
| .MSSTYLES | Windows XP Visual Style (Microsoft Corporation) |
| .MSSYTLES | Windows Visual Style File |
| .MST | Room Arranger Design File (Jan Adamec) |
| .MST | Windows SDK Setup Transform Script (Microsoft Corporation) |
| .MST | Presentation Master Presentation Document (Corel) |
| .MST | ChemFinder Chemical Structure Index |
| .MST | Pension System Master File (DATAIR Employee Benefit Systems, Inc.) |
| .MST | Minispecification |
| .MST | Visual Test Source File |
| .MSU | Blaise File (Statistics Netherlands) |
| .MSU | Vista Hotfix Installer Package (Microsoft Corporation) |
| .MSV | Memory Stick Compressed Voice File (Sony Corporation of America) |
| .MSV | MyStars! Saved View (Relative Data, Inc.) |
| .MSVC | Msvc Make File |
| .MSW | Word Text File (Microsoft Corporation) |
| .MSWMM | Windows Movie Maker Project (Microsoft Corporation) |
| .MSX | Age of Empires II: The Conquerors Expansion Multi-player Saved Game (Microsoft Corporation) |
| .MSX | Blaise File (Statistics Netherlands) |
| .MSX | SuperGraphic Studio Message File (Time-O-Matic, Inc.) |
| .MSX | Compressed CP/M File Archive |
| .MSX | Image Format |
| .MSX | Magic Splitter Split File Rebuild Information (Kynosoft, Brescia) |
| .MSZ | MiSZle Data/Parameter File (Mystic Fractal) |
| .MS_ | Winhelp Compressed File |
| .MT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MT2 | MadTracker Ver. 2.0 Module/Song (Yannick Delwiche) |
| .MT2S | AVCHD Video File |
| .MT9 | Music 2.0 Song or Album |
| .MTA | Flight Simulator Maintenance File (Microsoft Corporation) |
| .MTB | MINITAB Exec File |
| .MTD | Digital Sheet Music (Big Endian) (Musicnotes, Inc.) |
| .MTD | gMote Gesture Set File (Handform) |
| .MTE | TargetExpress Target (MCW Technologies Inc.) |
| .MTE | MadTracker Envelope File |
| .MTF | MicroSurfer File |
| .MTF | Mediatek Font |
| .MTF | Darkstone Archive |
| .MTF | Mathe Vektor MTF File |
| .MTG? | Jay Klein Making the Grade Teacher Gradebook Program |
| .MTGA | Homeworld (Sierra Entertainment, Inc.) |
| .MTH | Derive Math File |
| .MTHM | Multi-Channel Server (MCS) Theme Policy Editor Theme Policy (Volantis Systems Ltd.) |
| .MTI | MadTracker Instrument File |
| .MTI | Musitron MUSILI.ZIT Compressed File |
| .MTK | Matrikon Software License File |
| .MTK | MPU-401 Trakker |
| .MTL | Alias Material (Autodesk, Inc.) |
| .MTL | Mastercam Mill Tool Library (CNC Software, Inc.) |
| .MTL | MathLook File |
| .MTM | MultiTracker Music Module |
| .MTOOL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MTP | Minitab Portable Worksheet (Minitab Inc.) |
| .MTP | L&H Power Translator Pro |
| .MTP | MadTracker Pattern File |
| .MTP | Power Translator Document (Language Engineering Company) |
| .MTR | RealFlight Radio Control Airplane Description (Knife Edge Software) |
| .MTR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MTS | MadTracker Sample File |
| .MTS | Encore Samples File |
| .MTS | Viewpoint iPix File |
| .MTS | AVCHD Video Clip - MPEG Transport Stream |
| .MTT | Messenger Saved Contact File (Microsoft Corporation) |
| .MTV | MTV Video |
| .MTV | MTV Music Generator |
| .MTV | MTV Ray-tracer |
| .MTW | TRADOS MultiTerm Termbase |
| .MTW | Minitab Data File |
| .MTX | Temporary File often used by a Browser or TWAIN Device |
| .MTX | Marked Text Source File |
| .MTX | Matrix Spreadsheet (Grove Business Software) |
| .MTX | MadTracker Extension File |
| .MTX | M-Tx Music-From-Text Translator Source File |
| .MTX | GROMACS: Molecular Dynamics Hessian Matrix Format |
| .MTX | File WSOCK32.MTX Associated with MTX Worm |
| .MTX | Anjal2000 Tamil Text File Format Description |
| .MTX | Adobe Atmosphere File (Adobe Systems Incorporated) |
| .MTX | Viewpoint Media Player iPix File (Viewpoint Corporation) |
| .MTX | Max Magic Microtuner Tuning Interchange Document (Victor Cerullo) |
| .MTXT | Multi-Channel Server (MCS) Component Policy Editor Text Component (Volantis Systems Ltd.) |
| .MT_ | Encore Compressed Audio File |
| .MU | Quattro Menu (Corel) |
| .MU | PHASES MULIST Format File |
| .MUC | Collectorz.com Music Collector Collection Data (Collectorz.com) |
| .MUD | zMUD Settings File (Zugg Software) |
| .MUD | Yahoo! Mail Saved Attachment |
| .MUD | ACT! (Best Software CRM Division) |
| .MUF | ProtoMuck Multi User Forth Program |
| .MUF | Alpha Five Temporary Access Control File (Alpha Software, Inc.) |
| .MUI | Configuration Resource File (Microsoft Corporation) |
| .MUI | Opengl Glut-3.6 File |
| .MUI | Amiga MUI Default Class/Library (SASG) |
| .MUL | Ultima Online Game |
| .MUL | SeeYou Flight Data (Naviter) |
| .MULTICALC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MULTICL2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MULTICL3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MULTICLR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MUM | Matlab CAPE-OPEN Unit Operation Model File (AmsterCHEM) |
| .MUP | Music Publisher Data File (Braeburn Software) |
| .MUS | Infinity Game Engine Music Control File (BioWare Corp.) |
| .MUS | Finale Music Score (MakeMusic!) |
| .MUS | SCORE Music Publishing System Music Notation File (San Andreas Press) |
| .MUS | Harmony Assistant, Melody Assistant, Myriad Music plug-in, Melody Player Music File (MYRIAD) |
| .MUS | MusicTime/Doom Sound |
| .MUS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MUSE | Emacs Muse Project (Free Software Foundation, Inc.) |
| .MUSIC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MUTE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MUX | Trackmania Music File (NADEO) |
| .MUZ | Hover Game MIDI File |
| .MV | Miva Script (Prior to Ver. 4.14) (Miva Corp.) |
| .MV | IRIX makemovie Command Compressed Movie (Silicon Graphics, Inc.) |
| .MV3 | Oozic 3D MusicVideo |
| .MV3 | AUPEC Audio File |
| .MVA | Matrox Video Card Driver (Matrox Electronic Systems Ltd.) |
| .MVB | Manual Storage Format |
| .MVB | Database |
| .MVB | Multimedia Viewer (Microsoft Corporation) |
| .MVC | Collectorz.com Movie Collector Data File (Collectorz.com) |
| .MVC | Miva Compiled Script (Ver. 4.14 and Later) (Miva Corp.) |
| .MVD | Movie Edit Pro Video (MAGIX AG) |
| .MVD | MicroDVD DVD Movie |
| .MVD | MicroVision Database |
| .MVE | Interplay Video File |
| .MVE | Wing Commander III MVE Movie File Format |
| .MVE | muvee autoProducer Project File (muvee Technologies Pte. Ltd.) |
| .MVE | 4DVista Geological Model (Midland Valley Exploration) |
| .MVE | Infinity Game Engine (BioWare Corp.) |
| .MVF | AutoCAD Stop Frame File (Autodesk, Inc.) |
| .MVF | Production Studio Video (Babya) |
| .MVG | ImageMagick Vector Graphic (ImageMagick Studio LLC) |
| .MVHLINK | MyVirtualHome Link to Online Features (Creative Designer Software Pty Ltd) |
| .MVI | AutoCAD Movie Command (Autodesk, Inc.) |
| .MVL | WinMaven Saved Log File (David R. Snow) |
| .MVL | Interplay Multimedia File |
| .MVP | MediaView Project |
| .MVP | MVPstats Data File (MVP Programs) |
| .MVR | AutoCut Configuration File (Autometrix) |
| .MVS | MUSICMATCH Jukebox Visualization (MUSICMATCH, Inc.) |
| .MVU | EchoView Adaptive Binary Optimization Format File (MatrixView Pte. Ltd.) |
| .MVW | Saber LAN Log File |
| .MVX | Mixer File |
| .MVX | Intentia International Movex |
| .MW | MediaWiki Structured Text (MediaWiki.org) |
| .MW | Maple Worksheet (Maplesoft, a Division of Waterloo Maple Inc.) |
| .MW | Mail Wiper Mail Control File (Mail Wiper, Inc.) |
| .MW | MacWrite II Text Document (Apple Inc.) |
| .MW0 | Super Mario World File (Nintendo) |
| .MW1 | Super Mario World File (Nintendo) |
| .MW1 | SILK Spreadsheet |
| .MW2 | Super Mario World File (Nintendo) |
| .MW2 | MicroWorlds LOGO Activity (Logo Computer Systems Inc.) |
| .MW3 | Super Mario World File (Nintendo) |
| .MW4 | MechWarrior 4 Map (Game Structure Archive) (Microsoft Corporation) |
| .MWAND | GarageBand Lesson File (Apple Inc.) |
| .MWB | MySQL Workbench Database Structure (MySQL AB) |
| .MWD | Photo Soap2 File |
| .MWD | MWD Configuration File |
| .MWD3 | MoneyWorks Data File (Cognito Software) |
| .MWD5 | MoneyWorks Data File (Cognito Software) |
| .MWF | ProMotion Animation |
| .MWF | MapGuide Author Map Window (Autodesk, Inc.) |
| .MWI | Medlin Accounting Invoice Layout Information (Medlin Accounting) |
| .MWII | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MWII | MacWrite II Text Document |
| .MWL | Mighty Draw Windows Library (theliquidateher Software, An MCS Investments, Inc. Company) |
| .MWL | Super Mario World Level File (Nintendo) |
| .MWM | Mail Warrior File |
| .MWP | MegaWorks Pack File |
| .MWP | STEP7-Micro/WIN Siemens 200-series PLC Program (Siemens AG) |
| .MWP | Word Pro 97 Smartmaster File (IBM) |
| .MWS | Medlin Accounting Statement Layout Information (Medlin Accounting) |
| .MWS | Maple Spreadsheet (Maplesoft, a Division of Waterloo Maple Inc.) |
| .MWSP | ScanTango Plug-in (mindwrap, inc.) |
| .MWSP | Optix Screen Definition (mindwrap, inc.) |
| .MWT | MetaStock Stock Analysis Template (Equis International) |
| .MWV | MovieWorks File |
| .MW_ | Audio Utility Midimach Compressed File |
| .MX | MATLAB Common Matrix Routines (The MathWorks, Inc.) |
| .MX | MX Designer Remote Control File |
| .MX | Modula-3 Linker Information |
| .MX3 | MATLAB Windows Dynamically Linked Subroutines (The MathWorks, Inc.) |
| .MX3 | MP3 Encoded File |
| .MX3 | Bitbop Tuner Locked Sound File |
| .MXC | ArcView Geocoding Index For Read-Write Coverages (ESRI) |
| .MXC2 | Music Maker 12 Cache (MAGIX AG) |
| .MXD | ArcMap GIS Project File (Map) (ESRI) |
| .MXD | MX Editor Remote Control Device Configuration File |
| .MXE | VCom Error Report (V Communications, Inc.) |
| .MXE | Mindex Effect Album |
| .MXE | Quatro Pro Startup Macro (Corel) |
| .MXE | MXEdit File |
| .MXE | Macro Express |
| .MXF | MX Editor Remote Control File |
| .MXF | Material Exchange Format File |
| .MXF | SimCity Maxis Font File (Electronic Arts, Inc.) |
| .MXI | Macromedia Extension Information |
| .MXI | Mindex Indices File for Indexed Images |
| .MXI | Proteus File |
| .MXL | Moxcel Spreadsheet |
| .MXL | PackRat 5.0 Support File |
| .MXM | Mindex Master Index File for a Category |
| .MXM | MixMeister BPM Calculation File (MixMeister Technology) |
| .MXM | Project/Outlook Team Assign Task (Microsoft Corporation) |
| .MXMF | Mobile XMF File Format |
| .MXML | Flex Interface Component File (Adobe Systems Incorporated) |
| .MXP | 3-matic Project File (Materialise NV) |
| .MXP | Macromedia Extension Manager |
| .MXP | ArcReader Published Map |
| .MXS | ArcView Geocoding Index For Read-Write Shapefiles (ESRI) |
| .MXT | ArcMap Map Template (ESRI) |
| .MXT | C Data (Microsoft Corporation) |
| .MXV | Movie Edit Pro Video Format (MAGIX) |
| .MYB | MYOB Data File (MYOB Technology Pty Ltd.) |
| .MYC | Simply Safe Backup Archive (Joshua Cannon Butcher) |
| .MYD | MySQL Database (MySQL AB) |
| .MYDOCS | MyDocs Drop Target (Microsoft Corporation) |
| .MYI | MySQL Database Index (MySQL AB) |
| .MYL | MYLAI Multilingual Transliteration Scheme |
| .MYM | MyMenu Wii custom menu theme file (Icefire) |
| .MYO | MYOB Data File (MYOB Technology Pty Ltd.) |
| .MYP | Make Your Point Presentation |
| .MYR | Harmony Assistant, Melody Assistant, Myriad Music plug-in, Melody Player Music File (MYRIAD) |
| .MYS | Myst Saved Game (Cyan Worlds, Inc.) |
| .MYT | MyTraffic X AI Aircraft Traffic Database File (BK & simMarket.com) |
| .MYTHS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MYV | Vivaldi Studio Score File (goVivaldi Inc.) |
| .MYW | MyWorld Education Drawing |
| .MZ | MOZART Music Document (David Webber) |
| .MZ | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .MZB | MegaZeux Board |
| .MZC | MOZART Chord Dictionary (David Webber) |
| .MZE | Maze Creator File |
| .MZE | MidiMaze File |
| .MZF | MediaZip Compressed File (ACE) |
| .MZF | SHARP MZ-series Emulator File |
| .MZM | MegaZeux Dynamic Board Section |
| .MZP | MOZART Percussion File (David Webber) |
| .MZQ | SHARP MZ-series Emulator QuickDisk File |
| .MZS | SHARP MZ-series Emulator File |
| .MZT | MOZART Template File (David Webber) |
| .MZT | SHARP MZ-series Emulator File |
| .MZV | Viewpoint Media Player ZoomView Titles (Viewpoint Corporation) |
| .MZX | MegaZeux World |
| .M_C | MailCall 2 File |
| .M_P | Pro/ENGINEER Temporary File (PTC) |
| .M_U | MazeGold Critical File Backup |