| File extension | Developer/Producer | File description |
|---|---|---|
| M file extension | Apple | Objective-C Language Source Format |
| M!95 file extension | Adobe Systems Incorporated | Adobe Director For Mac |
| M-JPEG file extension | N/A | M-JPEG |
| M01 file extension | Bentley Systems, Incorporated | MicroStation Modification Resource |
| M10 file extension | Microsoft Corporation | Microsoft Money 2002 Data |
| M11 file extension | Microsoft Corporation | Microsoft Money 2003 Data |
| M12 file extension | Schiller | Schiller Medilog ECG Raw Data Format |
| M13 file extension | Microsoft Corporation | Microsoft Media Viewer |
| M14 file extension | Microsoft Corporation | Microsoft Media Viewer |
| M15 file extension | Moving Picture Experts Group | Apple QuickTime Format |
| M16 file extension | Microsoft Corporation | Microsoft Money 2007 Data |
| M1A file extension | N/A | MPEG-1 Audiostream Format |
| M1C file extension | IBM | IBM Voice Type Languages Newuser |
| M1I file extension | N/A | IBM Voice Type Languages Newuser |
| M1PG file extension | Media 100 | IFinish Video Format |
| M1S file extension | N/A | MPEG-1 System Stream |
| M1V file extension | N/A | Moving Pictures Experts Group Video (MPEG-1 IPB) |
| M2 file extension | Blizzard Entertainment | World Of Warcraft Model Object File Format |
| M21 file extension | N/A | MPEG-21 Video Format |
| M25 file extension | N/A | Symantec Endpoint Protection Manager |
| M2A file extension | N/A | MPEG-2 Audio |
| M2C file extension | IBM | IBM Voice Type Languages Newuser |
| M2D file extension | N/A | HTC Manila 2D For Windows Mobile Skin |
| M2DCT file extension | N/A | HTC Manila 2D For Windows Mobile Skin |
| M2F file extension | Maxthon International Limited | Maxthon Filter Package |
| M2I file extension | IBM | IBM Voice Type Languages Newuser |
| M2L file extension | Maxthon International Limited | Maxthon Language Package |
| M2M file extension | SourceForge.net | TiMidity++ M2M Settings |
| M2P file extension | Moving Picture Experts Group | MPEG-2 Stream File Format |
| M2R file extension | N/A | Avaya Mib2Rules Perl Script |
| M2S file extension | Maxthon | Maxthon Skin Installation Package |
| M2T file extension | N/A | MPEG-2 Transport Stream Format |
| M2TS file extension | Sony | MPEG-2 Stream (Blu-Ray) |
| M2U file extension | Maxthon International Limited | Maxthon Layout |
| M2V file extension | N/A | MPEG-2 Packetized Elementary Stream |
| M3 file extension | Blizzard Entertainment | Blizzard StarCraft 2 MDX3 Model Format |
| M32 file extension | 3D Realms/Apogee Software Ltd. | Duke Nukem 3D Script |
| M3C file extension | IBM | IBM Voice Type Languages Newuser |
| M3D file extension | N/A | DIALux 3D Object Format |
| M3G file extension | Nokia | Nokia Mobile 3D Graphics Program Format |
| M3H file extension | Blizzard Entertainment, Inc. | Starcraft 2 Model Data |
| M3I file extension | IBM | IBM Voice Type Languages Newuser |
| M3S file extension | Ubisoft Entertainment S.A. | Myst III Exile Saved Game |
| M3T file extension | Ubisoft Entertainment S.A. | Myst 3 Exile Text |
| M3U file extension | Nullsoft | MP3 Songs Playlist Format |
| M3U8 file extension | N/A | UTF-8 M3U Playlist Format |
| M3URL file extension | N/A | SMIL MP3 Playlist |
| M3V file extension | N/A | DJ Mix Pro Playlist |
| M3X file extension | MAGIX AG | MAGIX Digital Photo Maker PhotoCD Playlist |
| M4 file extension | N/A | M4 Preprocessor Macro Format |
| M4A file extension | Apple | MPEG-4 Compressed Audio Format |
| M4B file extension | Apple | MPEG-4 Audio Layer Audio Book Format |
| M4C file extension | IBM | IBM Voice Type Language Newuser |
| M4D file extension | The Sage Group plc | Sage MAS 90 Data |
| M4E file extension | N/A | MPEG-4 Video Format |
| M4F file extension | Sony Corporation | Sony Network Camera MPEG-4 Video |
| M4I file extension | IBM | IBM Voice Type Languages Newuser |
| M4L file extension | The Sage Group plc | Sage MAS 90 Data |
| M4P file extension | Apple | Apple ITunes Music Store Audio Format |
| M4R file extension | Apple | Apple IPhone Ringtone Format |
| M4S file extension | Ubisoft Entertainment S.A. | Myst IV: Revelation Save Game |
| M4T file extension | The Sage Group plc | Sage MAS 90 Table |
| M4U file extension | N/A | MPEG-4 Playlist Format |
| M4V file extension | Apple | MPEG-4 Video File Format |
| M51 file extension | ARM Holdings plc | ARM Keil Tools Linker Listing |
| M64 file extension | N/A | Mupen64 Movie Capture |
| M68 file extension | Embarcadero Technologies, Inc. | Turbo Pascal DOS |
| M75 file extension | Moving Picture Experts Group | Apple QuickTime Player Format |
| M7A file extension | MapKing International Limited | MapKing Map |
| M7D file extension | MapKing International Limited | MapKing Navigation Map |
| M7P file extension | N/A | Multilizer PDF Translator Project |
| M8 file extension | Raven Software | Heretic II MipMap Image |
| M?? file extension | Actian Corporation | Ingres Modify Table/Index |
| MA file extension | Autodesk | Autodesk Maya ASCII Scene Format |
| MA0 file extension | Blizzard Entertainment, Inc. | Diablo II Act 1 Saved Map Progress |
| MA1 file extension | Monarch | Monarch Audio Format |
| MA1MMF file extension | N/A | SMAF Synthetic Music Mobile Application Format |
| MA2 file extension | Olle Persson | Bibexcel |
| MA2MMF file extension | Yamaha Corporation | SMAF Synthetic Music Mobile Application Format |
| MA3 file extension | Harvard Graphics | Harvard Graphics Macro |
| MAB file extension | Mozilla | Mozilla Address Book Format |
| MAC file extension | Apple | MacPaint Bitmap Image |
| MACA file extension | Apple, Inc. | MacWrite Document |
| MACBIN file extension | Apple | MacBinary Archive |
| MACP file extension | Apple, Inc. | Apple Macintosh MacPaint Bitmap Image |
| MACS file extension | inoage GmbH | MADRIX Encrypted Script |
| MAD file extension | N/A | Microsoft Access Module Shortcut Format |
| MAE file extension | My Avatar Editor | My Avatar Editor Character Format |
| MAF file extension | Microsoft | Microsoft Access Form Shortcut Format |
| MAFF file extension | Mozilla | Mozilla Archive Format |
| MAG file extension | Microsoft | Microsoft Access Diagram Shortcut Format |
| MAGIC file extension | SourceForge.net | Magic Mail Monitor Configuration |
| MAGIK file extension | GE | Magik Source Code Format |
| MAHJONGTITANSSAVE-MS file extension | Microsoft | Mahjong Titans Save Game Format |
| MAI file extension | Microsoft | Microsoft Mail Message Format |
| MAILDB file extension | N/A | MSN Mail |
| MAILHOST file extension | Microsoft | E-mail Server Preferences Format |
| MAILLOC file extension | Apple, Inc. | Apple Mac OS X Finder Mail Internet Location |
| MAILPLANELICENSE file extension | uncomplex | Mailplane License Format |
| MAILSTATIONERY file extension | Apple, Inc. | Apple Mail |
| MAILTOLOC file extension | Apple | Apple Mail Mail Address Format |
| MAIN file extension | FileMaker, Inc. | FileMaker Dictionary |
| MAJ file extension | Autodesk, Inc. | Camduct Job |
| MAK file extension | N/A | Make Format |
| MAKE file extension | Apple | Makefile |
| MAKEFILE file extension | N/A | Makefile |
| MAKER file extension | Adobe Systems Incorporated | Adobe Framemaker |
| MAKI file extension | Nullsoft, Inc. | Winamp MAKI Compiled Script |
| MAKO file extension | Mako | Mako Tamplate Format |
| MAL file extension | MadAppLauncher | MadAppLauncher Settings Format |
| MAM file extension | Microsoft | Microsoft Access Macro Shortcut Format |
| MAML file extension | Microsoft Corporation | Microsoft Assistance Markup Language |
| MAN file extension | N/A | Unix Text Manual Format |
| MANAGED_MANIFEST file extension | Microsoft Corporation | Silverlight Manifest |
| MANI file extension | Mine-imator | Mine-imator Project Format |
| MANIFEST file extension | N/A | Windows Visual Styles Format |
| MANIFEST-DESKTOP file extension | Canonical Ltd. | Ubuntu Desktop CD Manifest |
| MANM file extension | Pterodon | Vietcong Game Data Format |
| MAO file extension | BioWare | Dragon Age Origins MAO XML |
| MAP file extension | id Software | Game Map Format |
| MAPIMAIL file extension | N/A | Windows Send To Mail Recipient Format |
| MAPLET file extension | Blitz Research | Maplet World Format |
| MAPLIB file extension | Hewlett-Packard Company | Mscape Map |
| MAPSDATA file extension | Apple | Apple IOS Map Data Format |
| MAPX file extension | Mapjects Development | Mapjects GRYD Webserver Format |
| MAQ file extension | Microsoft | Microsoft Access Query Shortcut Format |
| MAR file extension | Microsoft | Microsoft Access Report Shortcut Format |
| MARC file extension | MarcEdit Development | MAchine-Readable Cataloging (MARC) Document |
| MARKDN file extension | John Gruber | Markdown Markup Language Document Format |
| MARKDOWN file extension | John Gruber | Markdown Markup Language Format |
| MARS file extension | Adobe Systems | Adobe Mars Format |
| MARSHAL file extension | RISE to Bloome Software | Marshal Editor Data Migration Model Format |
| MART file extension | MartView | Martview Ebook Format |
| MAS file extension | N/A | Microsoft Access Stored Procedures Format |
| MASH file extension | Oracle Corporation | Java |
| MASK file extension | Adobe Systems | SpeedGrade Color Mask Format |
| MASSEFFECTPROFILE file extension | Electronic Arts | Mass Effect User Profile |
| MASSEFFECTSAVE file extension | Electronic Arts | Mass Effect Saved Game |
| MASTER file extension | Microsoft | ASP Master Page Format |
| MAT file extension | The MathWorks | MATlab Workspace Variables Format |
| MATCH-RDB file extension | Richard Hughey - Kevin Karplus - Anders Krogh | RDB |
| MATERIAL file extension | N/A | Rigs Of Rods Texture Reference Format |
| MATH file extension | Paul Hunter | AnalyticMath |
| MATLAB file extension | N/A | Matlab Script |
| MATO file extension | Mojiferous Industries | Atomic Combat Saved Game Format |
| MATPROJ file extension | BioWare | Dragon Age Origins Material |
| MAU file extension | N/A | Media Attachment Unit Format |
| MAUD file extension | N/A | Amiga MAUD Sound |
| MAV file extension | N/A | Microsoft Access View Format |
| MAW file extension | N/A | Microsoft Access Data Access Page Format |
| MAX file extension | Autodesk | 3D Studio Max Scene Format |
| MAXC file extension | Autodesk | 3D Studio Max Container Format |
| MAXD file extension | N/A | PaperPort Annotation |
| MAXM file extension | N/A | Paperport |
| MAZ file extension | Hover | Microsoft Windows Hover! Maze Format |
| MB file extension | Autodesk | Autodesk Maya Binary Scene Format |
| MB1 file extension | 3D Realms/Apogee Software Ltd. | Monster Bash Game Data |
| MB3 file extension | SUIGYODO ONLINE | Minimal Board Editor (MBE) |
| MB4 file extension | Evan Design | Model Builder Model Design |
| MBA file extension | Beneficent Technology, Inc. | Martus Human Rights Bulletin System |
| MBAC file extension | HI CORPORATION | MascotCapsule Resource |
| MBAS file extension | MikroElektronika | MikroBasic Source Code |
| MBB file extension | Kodak | Kodak EasyShare Data Format |
| MBBK file extension | ManaBook Software | ManaBook Book Kit Format |
| MBC file extension | Cyrus Daboo | Mulberry E-mail Client Cache |
| MBD file extension | MediaChance | Multimedia Builder MP3 Authoring Format |
| MBDB file extension | Apple, Inc. | Apple IOS Backup Manifest |
| MBDX file extension | Apple, Inc. | Apple IOS Backup Manifest |
| MBE file extension | Electronic Arts, Inc. | MVP Baseball 2005 Game |
| MBF file extension | Microsoft | Microsoft Money Backup Format |
| MBFAVS file extension | N/A | Stardent AVS X Bitmap Image |
| MBFS file extension | N/A | Stardent AVS X Bitmap Image |
| MBFX file extension | N/A | AVS X Image |
| MBG file extension | Fookes | Mailbag Assistant E-mail Archive Format |
| MBI file extension | MagicISO | MagicISO Multi-bootable Information Format |
| MBK file extension | dataBased Intelligence | DBASE IV Multiple Index File Backup |
| MBKP file extension | Memeo | Memeo Instant Backup Backup |
| MBL file extension | Vernier | Logger Pro Experiment Data Format |
| MBM file extension | N/A | EPOC Multi-bitmap Format |
| MBOX file extension | N/A | Mail Mailbox Format |
| MBP file extension | Mobipocket | Mobipocket EBook Auxiliary Format |
| MBP1 file extension | Amazon.com, Inc. | Kindle Touch Annotation |
| MBR file extension | N/A | Master Boot Record Format |
| MBS file extension | Opera Software | Opera Mailbox Format |
| MBSA file extension | Microsoft | Microsoft Baseline Security Analyzer Format |
| MBSB file extension | Mamut Software Ltd | Mamut Business Software Company Database Backup |
| MBSYNCSTATE file extension | Michael R. Elkins | Mbsync Folder Backup |
| MBT file extension | Scout Management Software | Blue Card Manager Merit Badge Template Format |
| MBTEMMPLATE file extension | Widget Press, Inc. | ModelBaker Custom Template Directory |
| MBV file extension | Victor Company of Japan, Ltd. | JVC Everio MediaBrowser Movie |
| MBW file extension | Firesage Solutions | Easy Mail Backup Wizard Format |
| MBX file extension | N/A | E-mail Mailbox Format |
| MBZ file extension | N/A | Pogoshell NES Emulator Plugin |
| MC file extension | Microsoft Corporation | Microsoft Windows Localized Message Table Resource |
| MC1 file extension | MedCalc | MedCalc Data Format |
| MC2 file extension | ValuSoft | MasterCook Cookbook Recipe Text Data Format |
| MC3 file extension | Interactive Design Systems | Bridge Design Modeler 3D Match-casting Geometry Control |
| MC4D file extension | MAXON Computer GmbH | Cinema 4D 3D Graphic |
| MC5 file extension | Smith Micro | Poser 5 Material Format |
| MC6 file extension | Smith Micro | Poser 6 Material Format |
| MC8 file extension | CNC Software, Inc. | Mastercam V8 |
| MC9 file extension | CNC | Mastercam V9 CAD Format |
| MCA file extension | Mojang | Minecraft Anvil Format |
| MCACC file extension | Pioneer Europe NV | MCACC Measurement Data |
| MCB file extension | N/A | NEPLAN Project |
| MCBN file extension | N/A | Microsoft Excel 4 For Mac Chart |
| MCC file extension | Parametric Technology Corporation | Mathcad Configuration |
| MCD file extension | PTC | MathCAD Document Format |
| MCDB file extension | Adobe Systems Incorporated | Adobe Premiere Pro Media Cache Database |
| MCDX file extension | PTC | Mathcad Prime Document Format |
| MCF file extension | ValuSoft | MasterCook Cookbook Format |
| MCFI file extension | Autodesk | Autodesk Maya Initial Fluid Cache Format |
| MCFP file extension | Autodesk | Autodesk Maya Fluid Cache Playback Format |
| MCGAME file extension | Minecraft Launcher | Minecraft Backup Format |
| MCI file extension | N/A | Media Control Interface Command Script Format |
| MCK file extension | NewSoftwares.net, Inc. | Macro Keys Encrypted Macro |
| MCL file extension | Microsoft | Microsoft Media Center Application Shortcut Format |
| MCLEVEL file extension | Mojang Specifications | Minecraft Map Format |
| MCMAC file extension | Mariner Software, Inc. | MacGourmet MasterCook Document |
| MCMETA file extension | Mojang | Minecraft Animation Settings Format |
| MCML file extension | Microsoft Corporation | Microsoft Windows Media Center MCML |
| MCO file extension | Microsoft | MSN Messenger Wink Format |
| MCP file extension | Freescale Semiconductor | CodeWarrior Project Format |
| MCR file extension | Autodesk | Autodesk 3D Studio Max Macroscript Format |
| MCRP file extension | Bermin Software | MobyExplorer Encrypted Format |
| MCS file extension | Mathsoft | MathCAD Raster Picture Image Format |
| MCSP file extension | Crafting.co.uk | My Craft Studio Project Format |
| MCSX file extension | Crafting.co.uk | My Craft Studio Professional Format |
| MCT file extension | N/A | Musicator MIDI |
| MCUSW file extension | Nokia Corporation | Nokia Mobile Phones With Symbian Firmware |
| MCV file extension | N/A | ManyCam Effect |
| MCW file extension | Hex2Bit | Monitor Calibration Wizard Format |
| MCWORLD file extension | Minecraft Launcher | Minecraft World Backup Format |
| MCX file extension | CNC Software | Mastercam X And X2 File Format |
| MCXE file extension | Clinical & Biomedical Computing | MedicinesComplete Data Format |
| MCXML file extension | Microsoft Corporation | Microsoft Office 2013 XML Settings |
| MCZ file extension | Smith Micro | Poser Compressed Material Format |
| MD file extension | Reilly Technologies | Moneydance Financial Data Format |
| MD0 file extension | Alcohol Software | Alcohol 120% Disk Image Segment Format |
| MD03 file extension | Adobe Systems Incorporated | Adobe Director |
| MD1 file extension | N/A | GEAR CD Suite CD Image Format |
| MD2 file extension | id Software | Quake 2 Model Format |
| MD2P file extension | Matt Holwood | MessengerDiscovery |
| MD2S file extension | Matt Holwood | MessengerDiscovery |
| MD3 file extension | id Software | Quake 3 Model Format |
| MD4 file extension | id Software LLC | Quake 3 MD4 Skeletal Model Format |
| MD5 file extension | N/A | Checksum Format |
| MD5TXT file extension | N/A | Message Digest 5 Hash Format |
| MD5ANIM file extension | id Software | Doom 3 ID Tech 4 Game Engine Model Animation Format |
| MD5CAMERA file extension | id Software | Doom 3 ID Tech 4 Game Engine Model Camera Format |
| MD5MESH file extension | id Software | Doom 3 ID Tech 4 Game Engine 3D Mesh Format |
| MD8 file extension | GarageCUBE | GarageCUBE Modul8 Project Format |
| MDA file extension | N/A | Microsoft Access Add-in Format |
| MDAT file extension | John Mulcahy | REW Measurement |
| MDB file extension | Microsoft | Microsoft Access Database Format |
| MDBACKUP file extension | Apple | Apple IPhone Backup Format |
| MDBHTML file extension | Microsoft | Microsoft Office Access HTML Document Format |
| MDBX file extension | N/A | Access Based Database |
| MDC file extension | Cognos | Cognons Powerplay Power Cube Database Format |
| MDD file extension | Point Oven | Point Oven Deformation Data Format |
| MDDATA file extension | Apple | Apple IPhone Backup Data Format |
| MDE file extension | N/A | Microsoft Access Compiled Database (application) Format |
| MDES file extension | Trimaran Team | Trimaran Machine Description |
| MDF file extension | Alcohol Software | Alcohol 120% Disc Image File Format |
| MDG file extension | Sparx Systems Pty Ltd. | Enterprise Architect |
| MDHTML file extension | Microsoft Corporation | Microsoft Access HTML |
| MDI file extension | Microsoft | Microsoft Office Document Imaging File Format |
| MDIMPORTER file extension | Apple, Inc. | Spotlight Importer Setting |
| MDINFO file extension | Apple | Apple IPhone Info Format |
| MDK file extension | Ad Astra Information Systems, LLC | Astra Schedule Schedule |
| MDL file extension | Blizzard Entertainment | 3D GameStudio Model Entity Format |
| MDLE file extension | N/A | Motion Description Language Extended |
| MDM file extension | Scientific Software International | HLM Multivariate Data Matrix Format |
| MDMP file extension | Microsoft | Microsoft Windows Minidump Format |
| MDN file extension | N/A | Microsoft Access Blank Database Template Format |
| MDO file extension | Alcohol Soft | Alcohol 120% Split Image |
| MDOWN file extension | John Gruber | Markdown Markup Language Format |
| MDP file extension | Microsoft | Microsoft Visual C++ Visual J++ MAK File (old Project Workspace) |
| MDPF file extension | Apple, Inc. | Mac OS X Modem Preferences |
| MDPL file extension | Apple, Inc. | MacDraw II |
| MDR file extension | N/A | ZX Spectrum Microdrive Emulator |
| MDRC file extension | inoage GmbH | MADRIX DMX Remote Configuration |
| MDRW file extension | Apple, Inc. | MacDraw |
| MDS file extension | N/A | Alcohol 120% Image File (media Descriptor File) Format |
| MDT file extension | N/A | Microsoft Access Database Template Format |
| MDTEXT file extension | John Gruber | Markdown Markup Language |
| MDTXT file extension | John Gruber | Markdown Markup Language |
| MDUS file extension | Matt Holwood | MessengerDiscovery |
| MDV file extension | N/A | QLAY |
| MDW file extension | N/A | Microsoft Access Workgroup Information Format |
| MDWN file extension | John Gruber | Markdown Markup Language |
| MDX file extension | Blizzard Entertainment | Blizzard Entertainment 3D Model Format |
| MDZ file extension | N/A | Microsoft Access Wizard Template Format |
| MDZIP file extension | No Magic | MagicDraw Compressed Project Format |
| ME file extension | N/A | Readme Text Format |
| ME2HEADMORPH file extension | BioWare | Mass Effect 2 Head Morph |
| ME2MOD file extension | N/A | Mass Effect 2 Game Modification Format |
| MEA file extension | Malvern Instruments Ltd. | Mastersizer 2000 Sample Analysis |
| MEB file extension | Ecru Software | PRO100 Library Format |
| MECH file extension | Parametric Technology Corporation | Pro/MECHANICA Settings |
| MECONTACT file extension | Microsoft Corporation | Microsoft Live Messenger |
| MED file extension | N/A | Amiga MED Sound Format |
| MEDIAWIKI file extension | N/A | Mediawiki Source |
| MEF file extension | Mamiya | Mamiya ZD MEF Image Format |
| MEG file extension | MEGA Team | MEGA Data Format |
| MEGA file extension | Megacubo | Megacubo Metafile |
| MEL file extension | Autodesk | Maya Embedded Language |
| MELL file extension | RedleX | RedleX Mellel Document Format |
| MELLEL file extension | RedleX | RedleX Mellel Document Format |
| MEM file extension | N/A | Corel WordPerfect Macro Editor Format |
| MEMB file extension | Parametric Technology Corporation | Pro/ENGINEER Temporary |
| MEN file extension | SoftCafe | MenuPro Restaurant Menu Design |
| MENC file extension | Microsoft | Microsoft Windows Mobile Encrypted Format |
| MENU file extension | id Software | Apple Mac OS X SystemUIServer MenuExtra Plugin Format |
| MENUDATA file extension | VMware, Inc. | VMWare Cache |
| MEO file extension | NCH Software | MEO Encrypted Format |
| MEQ file extension | Corel Corporation | Corel WordPerfect Macro Editor Print Queue |
| MER file extension | Rockwell Automation | Corel WordPerfect Macro Editor Resident Area Format |
| MERLIN2 file extension | ProjectWizards | Merlin Project Format |
| MERLINLICENSE file extension | ProjectWizards | Merlin License Format |
| MES file extension | Corel Corporation | Corel WordPerfect Macro Editor Work Space |
| MESA file extension | SGI | OpenGL GLUT |
| MESH file extension | Medit | 3D Graphic Format |
| MET file extension | eMule | EMule Cached Information Format |
| META file extension | RealNetworks | RealPlayer Metafile |
| META4 file extension | N/A | Metalink 4.0 |
| METADATA_NEVER_INDEX file extension | Apple | Spotlight Never Index Format |
| METALINK file extension | N/A | Metalink 3.0 |
| METASTOCK file extension | Thomson Reuters | Metastock Data |
| METRICLOG file extension | Apple, Inc. | Apple IOS Diagnostic |
| MEU file extension | Microsoft Corporation | DOS Shell Menu Group |
| MEW file extension | Multi Edit Software Incorporated. | MultiEdit Configuration |
| MEX file extension | Insight Software Solutions | Corel WordPerfect Macro Editor Expound Format |
| MEX4 file extension | MathWorks, Inc. | Sun-4/SPARC Dynamically Linked Subroutines |
| MEXDS file extension | MathWorks, Inc. | MATlab Dynamically Linked Subroutines |
| MEXHP3 file extension | MathWorks, Inc. | Matlab HP9000/series 300 Dynamically Linked Subroutines |
| MEXHP7 file extension | MathWorks, Inc. | Matlab HP9000/series 700 Dynamically Linked Subroutines |
| MEXN file extension | MathWorks, Inc. | Matlab NeXT Dynamically Linked Subroutines |
| MEXRS6 file extension | MathWorks, Inc. | Matlab IBM RS/6000 Dynamically Linked Subroutines |
| MEXSG file extension | MathWorks, Inc. | Matlab Dynamically Linked Subroutine |
| MEXW32 file extension | MathWorks, Inc. | MATlab Program Executable |
| MF file extension | Sun Microsystems | Java Manifest Format |
| MF2 file extension | Adobe Systems Incorporated | Authorware Mediator5 Multimedia |
| MF4 file extension | Vector Informatik GmbH | Version 4.0 Measurement Data Format |
| MFA file extension | Clickteam | Multimedia Fusion Development Format |
| MFALIST file extension | Ashampoo GmbH & Co. KG | Ashampoo Photo Commander Slideshow List |
| MFASL file extension | AOL Inc. | Netscape XUL Fastload Format |
| MFCRIBBON-MS file extension | Microsoft | MFC Ribbon Definition XML Format |
| MFD file extension | Adobe Systems Incorporated | Adobe Multiple Master Font Metrics Directory |
| MFE file extension | MobileFrame | MobileFrame Enterprise Data Format |
| MFF file extension | N/A | Cakewalk MIDI |
| MFG file extension | Parametric Technology Corporation | ProEngineer Manufacturing |
| MFI file extension | Microsoft Corporation | Windows 98 Resource Kit |
| MFIL file extension | Blizzard Entertainment | Blizzard Software Update Format |
| MFJ file extension | Jarrold Group - Physical and Analytical Chemistry | MOBCAL Data |
| MFK file extension | N/A | Memsoft OS/2 Database |
| MFL file extension | Mozilla | Mozilla Firefox XUL Fastload Format |
| MFM file extension | MicroPress Inc. | VTeX Multiple Master Font Metrics |
| MFO file extension | Perl | Perl ModInfo Descriptor Format |
| MFP file extension | Adobe Systems | Macromedia FlashPaper Document Format |
| MFPS file extension | CYZSoft | Scientific Calculator Plus Script |
| MFR file extension | Autodesk, Inc. | Autodesk Moldflow Result |
| MFS file extension | EnderUNIX | MetFS Encrypted FUSE Based Formatsystem Format |
| MFT file extension | Neato | Mediaface Project Template Format |
| MFU file extension | MobileFrame | MobileFrame Update Format |
| MFV file extension | MobileFrame | MobileFrame Device Pack Format |
| MFW file extension | MobileFrame | Motorola MSS Box Firmware Format |
| MFX file extension | Clickteam | Multimedia Fusion Extension Format |
| MG file extension | N/A | EarAche Audio |
| MG1 file extension | Kenneth Adams | MusiGenesis Project |
| MG2 file extension | PG Music Inc. | Band-in-a-Box Song |
| MG4 file extension | PG Music Inc. | Band-in-a-Box Song |
| MG9 file extension | PG Music Inc. | Band-in-a-Box Song |
| MGA file extension | Manga Reader | Manga Comics Document Format |
| MGB file extension | N/A | Paragon5 Gameboy Tracker Audio |
| MGC file extension | N/A | MGCSoft Equation Illustrator Data Format |
| MGCB file extension | MGCSoft | MGCSoft Equation Illustrator Project Format |
| MGD file extension | Maxium Developments | Master Grade Gradebook |
| MGDATABASE file extension | Mariner Software | MacGourmet Deluxe Database Format |
| MGE file extension | N/A | MGE Data Server Project |
| MGF file extension | Lawrence Berkeley National Laboratory | ASCII-based 3D Rendering Materials And Geometry Format |
| MGK file extension | ImageMagick Studios | ImageMagick Settings Format |
| MGL file extension | Microsoft | Age Of Empires II Age Of Kings Game Format |
| MGLR file extension | GeoVisu Development Team | Magellan Routes |
| MGLT file extension | GeoVisu Development Team | Magellan Tracklogs |
| MGLW file extension | GeoVisu Development Team | Magellan Waypoint |
| MGM file extension | N/A | MGCSoft Equation Editor Macro File Format |
| MGMF file extension | MindGenius | MindGenius Mind Map |
| MGMT file extension | MindGenius | MindGenius 2-3 Template |
| MGMX file extension | MindGenius | MindGenius Map Format |
| MGN file extension | N/A | Modern Genealogy Database |
| MGO file extension | Mariner Software | MacGourmet Recipe Format |
| MGOURMET file extension | Mariner Software | MacGourmet Deluxe Document |
| MGOURMET3 file extension | Mariner Software | Mariner MacGourmet Document Format |
| MGR file extension | N/A | MGR Bitmap Image |
| MGS file extension | MGCSoft | MGCSoft Vector Shapes Format |
| MGSPOT file extension | Mariner Software, Inc. | MacGourmet Metadata |
| MGT file extension | Musicnotes | Guitar Guru Song Format |
| MGTHEME file extension | Mariner Software | MacGourmet Theme Format |
| MGTX file extension | MindGenius | MindGenius XML Template Format |
| MGU file extension | PG Music Inc. | Band-in-a-Box MIDI |
| MGV file extension | Sony | Sony PSP Video Format |
| MGX file extension | Microsoft | Age Of Empires 2 Replay Format |
| MGZ file extension | Konami Corporation | Metal Gear Solid Game Archive |
| MHD file extension | Bethesda Softworks LLC | Fallout 3 |
| MHE file extension | Procedimientos-Uno, S.L. | MHwinEHE Project |
| MHK file extension | Brøderbund Software, Inc. | Riven Movie Data |
| MHP file extension | N/A | Mailshift Internet Mail Document |
| MHS file extension | N/A | Xilinx Platform Studio Hardware Specification Format |
| MHT file extension | N/A | Mime HTML (MHTML) Format |
| MHTENX file extension | Egis Technology Inc. | Egis Encrypted HTM |
| MHTM file extension | N/A | Mime HTML (MHTML) |
| MHTML file extension | N/A | Mime MHTML Format |
| MHTMLENX file extension | Egis Technology Inc. | Egis Encrypted MHTML |
| MHV file extension | Husqvarna Viking | Husqvarna Viking Data |
| MI file extension | Oracle Corporation | AutoVue Graphic Plugin |
| MI2 file extension | Autodesk, Inc. | Autodesk Softimage |
| MI4 file extension | NVIDIA | NVidia PortalPlayer Firmware Update Format |
| MIB file extension | Milenix Software Ltd. | MyInfo Topic Backup |
| MIC file extension | Microsoft | Microsoft Image Composer Image Format |
| MID file extension | N/A | MIDI Audio Format |
| MIDI file extension | N/A | MIDI-sequention Sound Format |
| MIF file extension | Adobe Systems | MapInfo Interchange Format |
| MIFF file extension | ImageMagick Studio LLC | Magick Image |
| MIG file extension | Microsoft | Windows Easy Transfer Migration Data Format |
| MIH file extension | Brain Research Institute | MRtrix Image Header |
| MII file extension | Nintendo | Nintendo Wii Virtual Avatar Format |
| MIK file extension | Pitney Bowes Software Inc. (MapInfo) | MapInfo MapImagery Encryption Key |
| MIL file extension | N/A | Micro Illustrator Uncompressed Image |
| MILK file extension | Nullsoft | Winamp MilkDrop Plugin Configuration Format |
| MILLPST file extension | BobCAD-CAM Inc. | BobCAD Post Processor Data |
| MIM file extension | Internet Engineering Task Force | Multi-Purpose Internet Mail Extensions Format |
| MIME file extension | The Internet Engineering Task Force | Multi-Purpose Internet Mail Extensions (MIME) File Format Format (RFC822) |
| MIN file extension | Okuma | Okuma CNC Program Format |
| MINDNODE file extension | Markus Müller | MindNode Document Format |
| MINE file extension | Mojang Specifications | Minecraft Map Format |
| MINESWEEPERSAVE-MS file extension | Microsoft | Microsoft MineSweeper Save Format |
| MINGW32 file extension | MinGW.org | Mingw Compiler |
| MINI2SF file extension | N/A | Nintendo DS Sound Information Format |
| MININCSF file extension | Naram Qashat | NCSF Nintendo DS Audio Format |
| MINIPSF file extension | N/A | Miniature PlayStation Sound Format |
| MINIPSF2 file extension | N/A | Miniature PlayStation Sound Format |
| MINISO file extension | Fengtao Software Inc. | DVDFab Miniso Disk Image |
| MINIUSF file extension | N/A | Nintendo 64 Song Format |
| MINT file extension | Linux Mint | Linux Mint Installer Format |
| MIO file extension | Mioplanet Technologies | MIO Multimedia Format |
| MIP file extension | Corel | Corel PaintShop Pro Multiple Image Print Format |
| MIPR file extension | Logiciels & Services Duhem | MacImage Hybrid CD-ROM Project |
| MIR file extension | Mini-Image Ripper | Mini Image Ripper Disk Image Format |
| MIRADI file extension | Benetech Initiative | Miradi Project |
| MIS file extension | N/A | Mission Format |
| MISO file extension | Logiciels & Services Duhem | MacImage ISO+ Project |
| MISSION file extension | Immersive Education | MissionMaker Project Format |
| MIT file extension | MineEdit | MineEdit Inventory Template Format |
| MIV file extension | MapImagery Pty Ltd. | MapImagery Vendor Profile |
| MIX file extension | Microsoft | Microsoft PhotoDraw Image |
| MIZ file extension | N/A | Winamp Compressed Midi |
| MJ2 file extension | N/A | JPEG 2000 Motion Sequence Format (ISO 15444-3) Format |
| MJ3 file extension | id Software LLC | Id Software Online Sale |
| MJBOOKTEMPLATE file extension | Mariner Software, Inc. | MacJournal Book Template |
| MJD file extension | Adobe Systems | Adobe Acrobat MIME Encoded Job Definition Format |
| MJDOC file extension | Mariner Software | MacJournal Document Format |
| MJF file extension | N/A | Mjuice MP3 Audio |
| MJG file extension | N/A | Trojan |
| MJP file extension | LG | VTech MJP Video Format |
| MJP2 file extension | N/A | JPEG 2000 Motion Sequence Format (ISO 15444-3) |
| MJPG file extension | N/A | Motion JPEG Video Format |
| MJR file extension | J. River, Inc. | Media Jukebox Registration |
| MJZ file extension | N/A | Trojan.Win32.Agent.mjz |
| MK file extension | N/A | Makefile Format |
| MK3D file extension | Matroska | Matroska MKV 3D Stereoscopic Video Format |
| MK4 file extension | Schiller | Schiller Medilog ECG Raw Data Format |
| MKA file extension | Matroska | Matroska Audio Format |
| MKB file extension | Ideaworks3D Limited | Marmalade SDK Project |
| MKC file extension | Advanced Computer Innovations, Inc. | MagicKey Currency Exchange Rate |
| MKD file extension | John Gruber | Markdown Markup Language |
| MKDN file extension | John Gruber | Markdown Markup Language |
| MKE file extension | Microsoft Corporation | Microsoft Windows SDK Make |
| MKEXT file extension | Apple, Inc. | Mac OS X Mach Kernel Extension Memory Cache |
| MKEY file extension | CompeGPS TEAM S.L. | CompeGPS Land Registration Key |
| MKEYB file extension | CompeGPS TEAM S.L. | CompeGPS Land Registration Key |
| MKH file extension | N/A | WinMark Pro Mark |
| MKII file extension | Cloanto Italia srl | Mark2 SoundSystem Audio |
| MKJ file extension | N/A | MKJamz Audio |
| MKP file extension | N/A | Cinestar Remote Control Configuration |
| MKR file extension | Microsoft Corporation | Train Simulator Marker |
| MKS file extension | Advanced Computer Innovations, Inc. | MagicKey SmartType Settings |
| MKT file extension | Microsoft Corporation | Visual FoxPro Configuration |
| MKV file extension | Matroska | Matroska Video-audio Multimedia Format |
| MKV3D file extension | N/A | Matroska 3D Video Format |
| MKY file extension | Advanced Computer Innovations, Inc. | MagicKey Configuration |
| MKZ file extension | PokerOffice.com | PokerOffice Database Backup |
| ML file extension | Robin Milner | ML Language Source Code Format |
| ML2 file extension | Hypercube, Inc. | Tripos MOL2 Molecule |
| ML20 file extension | N/A | Mercury Messenger For Mac Video |
| ML3 file extension | KIDASA Software, Inc. | Milestones Project |
| ML4 file extension | KIDASA Software, Inc. | Milestones 4 Schedule |
| ML5 file extension | N/A | Milestones Project |
| ML9 file extension | N/A | Milestones Professional 2004U Schedule |
| MLA file extension | WorshipCenter Software | WorshipCenter Pro Document |
| MLB file extension | Microsoft | FoxPro For Macintosh Library |
| MLC file extension | Microsoft | Microsoft Windows Language Interface Pack Format |
| MLD file extension | N/A | I-Melody Format For I-Mode |
| MLE file extension | Dr. Torben Weibert | MAirList Event List |
| MLF file extension | N/A | Autodesk Mapguide Layer |
| MLG file extension | IBM | IBM Communications Server Message |
| MLI file extension | Autodesk, Inc. | Autodesk 3D Studio MAX Material |
| MLIB file extension | Richard Hughey - Kevin Karplus - Anders Krogh | Model Library |
| MLK file extension | ValuSoft | Sierra MasterCook Look Format |
| MLL file extension | Autodesk, Inc. | AutoDesk Maya Plug-in Format |
| MLM file extension | Novell, Inc. | Novell GroupWise Saved Email Message |
| MLN file extension | The Alchemy Team | Alchemy Source |
| MLOCATE file extension | The GNOME Project | Gnome Desktop |
| MLP file extension | Meridian Audio | Meridian Lossless Packing Audio Format |
| MLR file extension | IV Produkt AB | Mollier Sketcher |
| MLS file extension | KIDASA | Milestones Simplicity Format |
| MLSXML file extension | Skype Limited | Skype XML |
| MLT file extension | Business Forecast Systems, Inc. | Forecast Pro Multivariate Forecast |
| MLV file extension | National Instruments Corporation | LabVIEW Mathscript |
| MLW file extension | N/A | MainLog Data |
| MLX file extension | Blizzard Entertainment, Inc. | Starcraft Saved Game |
| MLY file extension | N/A | OCaml Ocamlyacc Input |
| MM file extension | FreeMind | FreeMind Mind Map Format |
| MM1 file extension | ActiveXperts Software B.V. | ActiveXperts MMS Toolkit Settings |
| MM3 file extension | CW Technical Services | Mortgage Minder Saved Mortgage Configuration |
| MM4 file extension | Microsoft Corporation | Microsoft Windows Word Processing Format |
| MM6 file extension | N/A | Might And Magic 6 Saved Game Format |
| MM7 file extension | N/A | Might And Magic 7 Saved Game Format |
| MM8 file extension | N/A | Might And Magic 8 Saved Game Format |
| MMA file extension | Intrepid Mouse | Master Album Maker Album Format |
| MMAP file extension | Mindjet | MindManager Map Format |
| MMAS file extension | Mindjet | MindManager Theme |
| MMAT file extension | Mindjet | MindManager Template Format |
| MMB file extension | www.MediaChance.com | MultiMedia Builder |
| MMC file extension | Microsoft | Microsoft Office XP Media Content Format |
| MMCH file extension | Freescale Semiconductor, Inc. | CodeWarrior Compiled Hdr |
| MMCOLLECTION file extension | Oasys | Microsoft Outlook Mail Manager Plug-in Collection Format |
| MMD file extension | MightyMango | Mangodata Multi-user Database |
| MMDC file extension | Ventis Media | MediaMonkey Mobile Device Settings Format |
| MMDF file extension | N/A | Multi-channel Memorandum Distribution Facility Mailbox Format |
| MMDL file extension | MITEK HOLDINGS, INC. | SAPPHIRE Structure Model |
| MMDR file extension | Adobe Systems Incorporated | Adobe Director |
| MME file extension | N/A | Multipurpose Internet Mail Extensions Format |
| MMF file extension | Yamaha | Synthetic Music Mobile Application Format |
| MMG file extension | Moritz Bunkus | MKVToolNix Muxing Settings |
| MMH file extension | BioWare | Dragon Age Model Mesh Heirarchy |
| MMIP file extension | Ventis Media | MediaMonkey Installation Format |
| MMJS file extension | Adobe Systems Incorporated | Adobe JavaScript Document |
| MMK file extension | Prof. RNDr. Jiri Kolafa, CSc. | MACSIMUS Define |
| MML file extension | Adobe Systems | Adobe FrameMaker Format |
| MMM file extension | MAGIX AG | MAGIX Music Maker Audio Format |
| MMN file extension | Memory-Map, Inc. | Memory-Map Navigator Overlay Object |
| MMO file extension | Memory-Map | Memory-Map Navigator Overlay Format |
| MMP file extension | Nokia | Symbian SDK Project Specification Format |
| MMPA file extension | MOR YAZILIM | MoreMotion Application Studio Page |
| MMPF file extension | Freescale Semiconductor, Inc. | CodeWarrior Preference |
| MMPR file extension | Freescale Semiconductor, Inc. | CodeWarrior Project |
| MMPZ file extension | SourceForge.net | Linux MultiMedia Studio Project |
| MMRC file extension | inoage GmbH | MADRIX MIDI Remote Configuration |
| MMS file extension | RAD Game Tools, Inc. | Miles Sound Tools |
| MMSW file extension | Write Brothers, Inc. | Movie Magic Screenwriter Document |
| MMT file extension | CoCo Systems Ltd. | CoCo Systems VisiMap |
| MMU file extension | Midori Media | MyPM Merge Data Format |
| MMV file extension | Sony | MicroMV Movie Format |
| MMW file extension | MechCAD Software | AceMoney Financial Data Format |
| MMX file extension | Westwood Studios (EA) | Command And Conquer Game |
| MMZ file extension | N/A | MusicMatch Theme |
| MN1 file extension | Microsoft Corporation | Microsoft Money Version 1 Data |
| MN2 file extension | Interplay Entertainment Corporation | Descent 2 Mission |
| MN3 file extension | Interplay Entertainment Corporation | Descent 3 Mission |
| MN4 file extension | Microsoft Corporation | Microsoft Money 95 Data |
| MN5 file extension | Microsoft Corporation | Microsoft Money 97 Data |
| MN6 file extension | Microsoft Corporation | Microsoft Money 98 Data |
| MN7 file extension | Microsoft Corporation | Microsoft Money 99 Data |
| MN8 file extension | Microsoft Corporation | Microsoft Money 2000 Data |
| MN9 file extension | Microsoft Corporation | Microsoft Money 2001 Data |
| MNB file extension | SciFace Software GmbH & Co. | MuPAD |
| MNC file extension | BC | My Notes Center Notebook Format |
| MND file extension | Autodesk, Inc. | AutoCAD Menu Compiler |
| MNE file extension | Microsoft Corporation | Microsoft Money |
| MNF file extension | MSC Software Corporation | ADAMS/Flex |
| MNG file extension | N/A | Multiple Network Graphics |
| MNH file extension | Sapper Oy | Master Navigator Header Format |
| MNI file extension | Activision | Star Trek Elite Force 2 Game |
| MNIT file extension | FlashPeak Inc. | FlashPeak SlimBrowser |
| MNK file extension | Wpg Computing | My Notes Keeper Notebook Format |
| MNL file extension | Autodesk | Autodesk AutoCAD Menu LISP Format |
| MNM file extension | Autodesk | Autodesk 3D Studio Max Character Studio Marker Name Format |
| MNO file extension | Adobe Systems | Macromedia Design Note |
| MNP file extension | Ultrasoft Digital Media | Ultrasoft Money |
| MNR file extension | Autodesk | Autodesk AutoCAD Compiled Menu Format |
| MNS file extension | Autodesk | AutoCAD Interface Settings Format |
| MNT file extension | N/A | Visual FoxPro Additional Menu Description Format |
| MNU file extension | Autodesk | Autodesk AutoCAD Menu Format |
| MNV file extension | Sony | Sony PlayStation Movie Format |
| MNX file extension | N/A | Visual FoxPro Main (DBF) Menu Description Format |
| MNY file extension | Microsoft | Microsoft Money Data Format |
| MO file extension | N/A | GNU Gettext Machine Object Format |
| MO3 file extension | Un4seen Developments | MO3 MOD Audio Format |
| MO? file extension | N/A | Standard Mail Archive |
| MOB file extension | MediaCorp | MOBTV Video Format |
| MOBI file extension | Mobipocket | Mobipocket EBook Format |
| MOBILECONFIG file extension | Apple | Apple IPhone Mobile Configuration Profile |
| MOBILEPROVISION file extension | Apple | Xcode Mobile Provisioning Profile |
| MOC file extension | N/A | MOCHA Java Script |
| MOCHA file extension | Adobe Systems Incorporated | Adobe Mocha For Adobe After Effects |
| MOD file extension | N/A | Audio Module |
| MODD file extension | Sony | Sony Video Analysis Format |
| MODE file extension | Panic | Coda For Mac Plugin Format |
| MODE1V3 file extension | Apple, Inc. | Xcode Project Settings |
| MODE2V3 file extension | Apple, Inc. | Xcode Project Related |
| MODEL file extension | Dassault Systemes | CATIA V4 Model Format |
| MODELPROJ file extension | Microsoft Corporation | Microsoft Visual Studio Modelling Project |
| MODULE file extension | Drupal | Drupal Module Format |
| MODUS file extension | Adobe Systems Incorporated | Adobe Mocha For Adobe After Effects Modus |
| MOF file extension | Desktop Management Task Force | Systems Management Server Managed Object Format |
| MOFF file extension | Sony | Sony AVCHD Index Format |
| MOG file extension | Sports Mogul Inc. | Football Mogul |
| MOGG file extension | N/A | Multitrack Digital Audio Format |
| MOHO file extension | Smith Micro | Anime Studio Animation Project Format |
| MOI file extension | N/A | MOI Video Format |
| MOJITO file extension | Lime Wire LLC. | Limewire Kademlia |
| MOKEY file extension | Adobe Systems Incorporated | Adobe Mocha For Adobe After Effects Mokey |
| MOL file extension | Symyx Technologies | MDL Molfile Molecule Format |
| MOL2 file extension | Tripos, L.P. | Portable Representation Of A SYBYL Molecule |
| MOLOGIQ file extension | N/A | HTC EVO 3D |
| MOM file extension | Apple | Managed Object Model |
| MOMMA file extension | KPULV | Offspring Fling Replay Format |
| MON file extension | Mozilla Corporation | Firefox Monday Bookmark Backup |
| MONET file extension | Adobe Systems Incorporated | Adobe Mocha For Adobe After Effects Monet |
| MONEY file extension | Jumsoft | Money Data Format |
| MONEYWELL file extension | No Thirst Software | MoneyWell Financial Data Format |
| MONITORPANEL file extension | Apple, Inc. | Apple Mac OS X Display Panel Extension |
| MONO file extension | N/A | Bi-level Bitmap |
| MONTAGE file extension | Mariner Software | Montage Screenplay Format |
| MONTE file extension | School of Aquatic & Fishery Sciences, University of Washington | CRiSP Harvest |
| MOO file extension | Apple, Inc. | Apple QuickTime Movie Clip |
| MOOD file extension | N/A | Amarok Moodbar Data |
| MOOV file extension | Apple | Apple QuickTime Movie Format |
| MOP file extension | N/A | MOPAC Input Format |
| MOPINT file extension | N/A | Mopac Internal Chemical Modeller Input |
| MOPOUT file extension | N/A | MOPAC Chemical Output |
| MOPP file extension | Havok.com Inc. | Havok Engine |
| MOR file extension | Corel Corporation | Corel Shared Writing Tools |
| MORG file extension | umonkey-tools | Morg |
| MORSE file extension | N/A | Ringtone Morse Code |
| MOS file extension | Leaf Imaging | Mamiya Digital Camera RAW Image Format |
| MOSAIC file extension | Frank M. Midgley | MacOSaiX Mosaic Format |
| MOSS file extension | AOL Inc. | Netscape Navigator For Mac HTML |
| MOT file extension | NewTek | LightWave Motion Format |
| MOTN file extension | Apple, Inc. | Apple Motion Motion |
| MOTOR file extension | Adobe Systems Incorporated | Adobe Mocha For Adobe After Effects Motor |
| MOU file extension | WinMount International | MOU Compressed Format |
| MOV file extension | Apple | Apple QuickTime Digital Movie Format |
| MOVIE file extension | Apple | Apple QuickTime Movie Format |
| MOX file extension | Imagine That | ExtendSim Model Format |
| MOXEL file extension | Adobe Systems Incorporated | Adobe Mocha For Adobe After Effects Moxel |
| MOZ file extension | N/A | Netscape Temporary Cache Format |
| MOZ-BACKUP file extension | Mozilla Corporation | Mozilla Backup |
| MOZ-DELETE file extension | Mozilla Corporation | Mozilla Firefox Update |
| MOZ-UPGRADE file extension | Mozilla Corporation | Mozilla Firefox Upgrade |
| MOZEML file extension | Mozilla Corporation | Mozilla Thunderbird Mail Message |
| MP file extension | Autodesk | Autodesk Maya Personal Learning Edition Format |
| MP+ file extension | N/A | MPEG Plus Audio |
| MP1 file extension | N/A | MPEG Audio Stream, Layer I Format |
| MP10 file extension | National Instruments | NI Multisim V10 Project Format |
| MP11 file extension | National Instruments | NI Multisim V11 Project Format |
| MP2 file extension | N/A | Sound File (MPEG-1 Layer II Audio Stream) |
| MP21 file extension | N/A | MPEG-21 Multimedia Format |
| MP2A file extension | N/A | Sound File (MPEG-1 Layer II Audio Stream) |
| MP2M file extension | Rockstar Games | Max Payne 2 Mod Format |
| MP2S file extension | Rockstar Games | Max Payne 2 Saved Game Format |
| MP2V file extension | N/A | MPEG Video Format |
| MP3 file extension | Moving Picture Experts Group | Compressed Audio And Music File, Mp3 Songs Or Ringtones |
| MP3A file extension | N/A | Renamed MP3 |
| MP3G file extension | TriceraSoft | WinCDG Pro MP3+G Karaoke |
| MP4 file extension | Moving Picture Experts Group | MPEG-4 Video File Format |
| MP4INFOVID file extension | N/A | Parrot AR Drone And Gyro Flyer Video |
| MP4A file extension | Apple, Inc. | MPEG-4 MP4A Codec Audio |
| MP4B file extension | Apple, Inc. | MPEG-4 Audio Layer Bookmarkable |
| MP4V file extension | Moving Picture Experts Group | MPEG-4 Video Format |
| MP5 file extension | Waterloo Maple Inc. | Maple Windows DOS |
| MP7 file extension | National Instruments | NI Multisim V7 Project Format |
| MP8 file extension | National Instruments Corporation | NI Multisim V8 Project |
| MP9 file extension | National Instruments | NI Multisim V9 Project Format |
| MP? file extension | Terry A. Davis | LoseThos Compiler Map |
| MPA file extension | N/A | MPEG Audio Format |
| MPB file extension | Franz Josef Wechselberger | MyPhoneExplorer Backup Format |
| MPC file extension | Musepack | MusePack Audio Format |
| MPCPL file extension | Media Player Classic | Media Player Classics Playlist Format |
| MPD file extension | Microsoft | Microsoft Project Database Format |
| MPDB file extension | Microsoft Corporation | Windows Media Player Database |
| MPDCONF file extension | The MPD Team | Music Player Daemon Settings Format |
| MPDP file extension | NCH Software | MixPad Project Format |
| MPDS file extension | inoage GmbH | MADRIX Plexus Settings |
| MPE file extension | N/A | MPEG Movie (Motion Pictures Experts Group) |
| MPEG file extension | N/A | MPEG Movie |
| MPEG1 file extension | N/A | Multiplexed MPEG-1/2 Format |
| MPEG2 file extension | N/A | Multiplexed MPEG-1/2 |
| MPEG4 file extension | N/A | MPEG-4 Video Format |
| MPEGA file extension | N/A | MPEG Sound |
| MPF file extension | Microsoft | Microsoft Design Gallery Format |
| MPG file extension | N/A | MPEG 1 Video File Format |
| MPG2 file extension | N/A | MPEG-2 Video Format |
| MPG3 file extension | N/A | MP3 Audio File For Mac |
| MPG4 file extension | N/A | MPEG-4 Video |
| MPGA file extension | N/A | Mpeg-1 Layer3 Audio Stream |
| MPGINDEX file extension | Adobe Systems | Adobe MPEG Index Format |
| MPGV file extension | N/A | MPEG-2 Video |
| MPH file extension | Impressum | Photoline4 Morphing |
| MPI file extension | The InstallJammer Team | InstallJammer Project Format |
| MPJ file extension | Minitab | MINITAB Spreadsheet Project Format |
| MPK file extension | ESRI | ArcGIS Map Package Format |
| MPKG file extension | N/A | Meta Package Format |
| MPKT file extension | MOPEKS Organisation | MOPEKS Trial |
| MPL file extension | Sony | AVCHD Playlist Format |
| MPLF file extension | Freescale Semiconductor, Inc. | CodeWarrior Library |
| MPLS file extension | Blu-ray Disc Association | Blu-ray Movie Playlist Information Format |
| MPM file extension | Rockstar Games | Max Payne Modification Format |
| MPNT file extension | Apple, Inc. | MacPaint Image Format |
| MPO file extension | CIPA | CIPA Multi-Picture Format |
| MPP file extension | Microsoft | Microsoft Project Plan Format |
| MPPX file extension | Microsoft Corporation | Microsoft Project Project |
| MPPZ file extension | Magicplot Systems | MagicPlot Project Format |
| MPP_ file extension | N/A | Microsoft Project For Mac Plan |
| MPQ file extension | Blizzard Entertainment | Blizzard Entertainment Archive Format |
| MPQE file extension | Blizzard Entertainment, Inc. | Blizzard Encrypted Game Data |
| MPR file extension | N/A | Visual FoxPro Generated Menu Program |
| MPRJ file extension | Native Instruments, Inc. | Maschine Project |
| MPS file extension | N/A | Microsoft Pocket Streets Map Format |
| MPSUB file extension | MPlayer | Subtitle Format |
| MPSY file extension | Freescale Semiconductor, Inc. | CodeWarrior Debug Symb |
| MPS_ file extension | Joshua Juran | MPW Shell |
| MPT file extension | Microsoft | Microsoft Project Template Tile |
| MPU file extension | N/A | MPEG Layer 3 Audio Format |
| MPV file extension | Moving Picture Experts Group | MPEG 1 Video Format |
| MPV2 file extension | N/A | MPEG II Video Format |
| MPVF file extension | CompeGPS TEAM S.L. | CompeGPS Land Fast Vector Map |
| MPW file extension | Microsoft | Microsoft Project Workspace Format |
| MPWD file extension | Apple, Inc. | MacWrite Pro |
| MPWR file extension | Apple, Inc. | MacWrite Pro |
| MPX file extension | N/A | FoxPro Compiler Menu |
| MPZ file extension | Benetech | Miradi Project Format |
| MPZIP file extension | National Instruments | Multisim Pack Format |
| MP_ file extension | N/A | Mobile Phone Sound Format |
| MQ4 file extension | MetaQuotes Software | MetaTrader Custom Indicator Format |
| MQH file extension | MetaQuotes Software Corp. | MetaTrader Trading Terminal |
| MQL file extension | MetaQuotes Software Corp. | MetaTrader Indicator |
| MQO file extension | Metasequoia | Metasequoia 3D Image Format |
| MQT file extension | MetaQuotes Software Corp. | MetaQuotes Language 4 MQL4 Template |
| MQV file extension | Sony | Sony Movie Player File Format |
| MRAW file extension | Photron USA, Inc. | Photron Camera RAW Image |
| MRB file extension | Microsoft | C++ Multiple Resolution Bitmap Graphic Format |
| MRC file extension | mIRC | MIRC Script Format |
| MRD file extension | MathRevolt | MathRevolt Infinity Document |
| MREC file extension | inoage GmbH | MADRIX Record |
| MRF file extension | Apple, Inc. | Macintosh Font |
| MRG file extension | MySQL | MySQL Reference Format |
| MRIMG file extension | Paramount Software UK | Macrium Reflect Disk Image Backup |
| MRK file extension | N/A | DPOF Digital Print Order Format Auto Print Order Format |
| MRL file extension | N/A | MRLR Multimedia Retrival Markup Language |
| MRM file extension | JoWooD Entertainment AG | Gothic 2 |
| MRML file extension | BWH | 3D Slicer Scene Description Format |
| MRO file extension | Graham Jones | SharpEye Music Reader |
| MRP file extension | MathRevolt | Infinity Solution Plot |
| MRS file extension | MAIET Entertainment | Gunz Game Data Format |
| MRT file extension | Stimulsoft | Stimulsoft Report Format |
| MRV file extension | ChemAxon Ltd. | MarvinSketch |
| MRW file extension | Minolta | Minolta Dimage RAW Image Format |
| MRXS file extension | Carl Zeiss MicroImaging | MIRAX Virtual Slide Format |
| MS file extension | Autodesk | 3D Studio Max Script Source Code |
| MS-TNEF file extension | N/A | Microsoft Transport Neutral Encapsulation Format |
| MS1 file extension | VIrtualBus | VirtualBus Map Format |
| MS10 file extension | National Instruments | NI Multisim V10 Circuit Design Format |
| MS11 file extension | National Instruments | NI Multisim V11 Circuit Design Format |
| MS2 file extension | N/A | SEQUEST Ms2 |
| MS3D file extension | Chumbalum Soft | MilkShape 3D Model Format |
| MS7 file extension | National Instruments | NI Multisim V7 Circuit Design Format |
| MS8 file extension | National Instruments | NI Multisim V8 Circuit Design Format |
| MS9 file extension | National Instruments | NI Multisim V9 Circuit Design Format |
| MSA file extension | N/A | Magic Shadow Archiver Atari Disk Image |
| MSB file extension | Oracle | Oracle Binary Message Format |
| MSC file extension | Microsoft | Microsoft Management Console Control Format |
| MSCG file extension | N/A | Microsoft Clip Art Gallery For Mac |
| MSCR file extension | JackAss JoeJoe | Rename Master Scrip |
| MSCT file extension | MOPEKS Organisation | MOPEKS Script |
| MSCX file extension | The MuseScore Team | MuseScore Music Score Format |
| MSCX, file extension | Werner Schweer | MuseScore Music Score Backup |
| MSCZ file extension | The MuseScore Team | MuseScore Compressed Music Score Format |
| MSCZ, file extension | Werner Schweer | MuseScore Music Score Backup |
| MSD file extension | ESRI | Map Service Definition Format |
| MSDEV file extension | Microsoft Corporation | Microsoft Visual C+ Make |
| MSDL file extension | N/A | Manchester Scene Description Language |
| MSDM file extension | Microsoft Corporation | Microsoft Windows |
| MSDVD file extension | Microsoft | Microsoft Windows DVD Maker Format |
| MSE file extension | Autodesk | 3D Studio Max Encrypted MAXScript Format |
| MSE-INSTALLER file extension | SourceForge.net | Magic Set Editor Installer |
| MSF file extension | N/A | Mozilla Thunderbird Mail Summary Format |
| MSG file extension | Microsoft | Saved Email Message |
| MSGR file extension | N/A | Microsoft Graph 5 |
| MSH file extension | N/A | Adobe Visual Communicator Project Format |
| MSHA file extension | Microsoft | Microsoft Help Library Help Manifest Format |
| MSHC file extension | Microsoft | Microsoft Help Container Format |
| MSHDB file extension | Rotunda Software | Ministry Scheduler Pro Database |
| MSHI file extension | Microsoft | Microsoft Help Index Format |
| MSHXML file extension | Microsoft Corporation | Microsoft XML Typedata |
| MSI file extension | Microsoft | Microsoft Windows Installer Installation Package |
| MSIE file extension | N/A | Microsoft Internet Explorer For Mac HTML |
| MSIF file extension | Avanquest | MyLabel Designer Deluxe Label Format |
| MSIL file extension | N/A | Microsoft Intermediate Language |
| MSJ file extension | MicroSurvey Software Inc. | MicroSurvey CAD Temporary |
| MSK file extension | Corel | Corel PaintShop Photo Pro Mask Image Format |
| MSKIN file extension | Maxthon International Limited | Maxthon Skin |
| MSKN file extension | Ventis Media | MediaMonkey Skin Format |
| MSL file extension | Microsoft | DocumentDirect And DocumentDirect Applications Suite File Format |
| MSLZ file extension | N/A | Archive |
| MSM file extension | Microsoft | Windows Installer Merge Module |
| MSMESSAGESTORE file extension | Microsoft Corporation | Windows Mail Message Information Database |
| MSN file extension | Microsoft | Microsoft Windows Network Related Format |
| MSO file extension | Microsoft | Inline E-mail Attachment |
| MSOF file extension | Microsoft Corporation | Microsoft Office For Mac |
| MSP file extension | Microsoft | Windows Installer Patch Format |
| MSPX file extension | Microsoft | Microsoft XML-based Web Page |
| MSRCINCIDENT file extension | Microsoft | Microsoft Windows Remote Assistance Request Format |
| MSS file extension | Xilinx | Xilinx Software Specification Format |
| MSSTYLE file extension | N/A | Windows XP Unsigned Style |
| MSSTYLES file extension | Microsoft | Microsoft Windows Resources Themes Luna Format |
| MST file extension | N/A | Windows Installer Transform Script Format |
| MSTAT file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Domain Output |
| MSTT file extension | Insoft Oy. | Prosa Minispecification |
| MSU file extension | Microsoft | Microsoft Update Standalone Package Format |
| MSV file extension | Sony | Sony Memory Stick Compressed Voice Files |
| MSVC file extension | Microsoft Corporation | Microsoft Visual C++ Compiler Makefile |
| MSW file extension | Corel | Painter Color Mixer Swatches Format |
| MSWD file extension | Microsoft Corporation | Microsoft Word For Mac Document |
| MSWK file extension | N/A | Microsoft Works For Mac |
| MSWMM file extension | Microsoft | Microsoft Windows Movie Maker Project Format |
| MSX file extension | Microsoft Studios | Age Of Empires II Saved Game |
| MSYM file extension | Graphisoft | ArchiCAD For MAC Geometric Description Language |
| MSZ file extension | Ventis Media, Inc. | MediaMonkey Skin |
| MS_ file extension | Microsoft Corporation | Microsoft Windows Winhelp Compressed |
| MT2 file extension | MadTracker | MadTracker 2 Module Format |
| MT9 file extension | ETRI | MT9 Audio Format |
| MTA file extension | Samsung | Samsung AllShare Metadata Format |
| MTB file extension | Digistore Solutions (S) Pte. Ltd. | MediaTracker Database Backup |
| MTC file extension | Digistore Solutions (S) Pte. Ltd. | MediaTracker Database |
| MTD file extension | Musicnotes | Musicnotes Digital Music Sheet Format |
| MTDD file extension | N/A | MEDITECH Document Definition |
| MTE file extension | N/A | MadTracker Envelope Gile |
| MTF file extension | N/A | Motorola Theme Format |
| MTG file extension | Jay Klein Productions | Making The Grade |
| MTH file extension | N/A | Derive Math Format |
| MTHD file extension | MOPEKS Organisation | MOPEKS Method |
| MTI file extension | N/A | MadTracker 2 Instrument Format |
| MTIFF file extension | N/A | Multi-page Tiff |
| MTK file extension | N/A | MPU-401 Trakker |
| MTKEY file extension | proDAD Inc. | ProDAD Heroglyph License |
| MTKT file extension | GeoVisu Development Team | MTK GPS Receiver Data |
| MTL file extension | N/A | OBJ Material Format |
| MTM file extension | N/A | MultiTracker Music Module (MOD) Format |
| MTML file extension | N/A | Meaningful Text Markup Language |
| MTN file extension | Crystal Impact GbR | Match! Database |
| MTO file extension | FastCAM Inc. | FastCAM MTO Data |
| MTP file extension | N/A | Minitab Portable Worksheet Format |
| MTR file extension | Knife Edge Software | RealFight Radio Control |
| MTRA file extension | HI CORPORATION | MascotCapsule Resource |
| MTS file extension | N/A | AVCHD MPEG-2 Transport Stream Format |
| MTS1 file extension | N/A | MPEG-2 Transport Stream |
| MTT file extension | Digital Confidence | MetadataTouch Template |
| MTV file extension | N/A | MTV Video Format |
| MTW file extension | Minitab | Minitab Data Format |
| MTX file extension | N/A | MadTracker Extension Format |
| MTXT file extension | MOPEKS Organisation | MOPEKS Problem |
| MTZ file extension | N/A | Compressed MetaStream Scene Format |
| MT_ file extension | GVOX | Encore Compressed |
| MU file extension | Squad | Kerbal Space Program Mesh Format |
| MU3 file extension | Myriad Software | Myriad Packed Musical Score |
| MUC file extension | Bitz & Pixelz BV | Music Collector Collection Data |
| MUD file extension | Lightbox Education | Textease Multi User Database |
| MUF file extension | Alpha Software | Alpha Five Access Control Format |
| MUG file extension | Hanesbrands Inc. | Hanes T-ShirtMaker Document |
| MUI file extension | Microsoft | MultiLanguage Windows Resource Format |
| MUIMANIFEST file extension | Microsoft Corporation | Microsoft Windows Multilingual User Interface |
| MUI_CCCD5AE0 file extension | Microsoft | Hid User Library |
| MUL file extension | Origin Systems | Ultima Online Game |
| MULIB file extension | Adobe Systems Incorporated | Adobe Muse Exported Library |
| MULT file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Alignment Output |
| MUM file extension | Microsoft | Windows Vista Update Package Format |
| MUP file extension | Braeburn Software | Music Publisher Data Format |
| MUS file extension | MakeMusic | Finale Music File Format |
| MUS10 file extension | N/A | Audio |
| MUSA file extension | Bungie Studios | Aleph One Music Format |
| MUSE file extension | Adobe Systems | Adobe Muse Project Format |
| MUSX file extension | Moretti & Murphy Reporting | Min‐U‐Script Xpress Transcript Data |
| MUT file extension | Broad Institute | Integrative Genomics Viewer Mutations List |
| MUX file extension | Ubisoft Entertainment | TrackMania Music Format |
| MUZ file extension | Hover | MUZ Audio Format |
| MV file extension | Miva Merchant | MivaScript Format |
| MV1 file extension | N/A | Video |
| MV4 file extension | N/A | Apple QuickTime Video |
| MV85 file extension | Adobe Systems Incorporated | Adobe Director For Mac Movie |
| MV93 file extension | Adobe Systems Incorporated | Adobe Director For Mac Movie |
| MV95 file extension | Adobe Systems Incorporated | Adobe Director For Mac Movie |
| MVA file extension | Microsoft Corporation | Microsoft Setup Archive |
| MVB file extension | N/A | Multimedia Viewer Book Format |
| MVC file extension | Miva Merchant | Sony Digital Mavica Photo Image Format |
| MVD file extension | MAGIX | Movie Edit Pro Video Format |
| MVDX file extension | MatchWare A/S | MindView MindMap Archive |
| MVE file extension | BioWare | Interplay Video Format |
| MVEX file extension | muvee | Muvee AutoProducer Unicode Document Format |
| MVF file extension | Autodesk, Inc. | AutoFlix Stop Frame |
| MVG file extension | ImageMagick Studio LLC | ImageMagick Proprietary Vector Graphics Format |
| MVI file extension | Autodesk | Autodesk AutoCAD Movie Command Format |
| MVL file extension | N/A | Medison 3D Volume Data |
| MVM file extension | MAGIX AG | MAGIX PhotoStory On DVD Slideshow |
| MVP file extension | MAGIX | Movie Edit Pro Video Project Format |
| MVR file extension | IBM | IBM HotMedia Multimedia Format |
| MVS file extension | N/A | Xilinx Project Language And Simulation Format |
| MVT file extension | Sebenza | Ultimate Wish Lists Template |
| MVV file extension | N/A | AVS Media Player MPEG Video |
| MVW file extension | McAfee, Inc. | Saber LAN Log |
| MVX file extension | Clickteam | Multimedia Fusion Movement Extension Format |
| MVY file extension | MAGIX | MAGIX Video Easy Project Format |
| MV_ file extension | MAGIX | Magix Movie Edit Pro Movie Backup Format |
| MW file extension | Maplesoft | Maple Worksheet Format |
| MW2 file extension | Logo Computer Systems Inc. | MicroWorlds Logo Activity |
| MW2D file extension | Apple, Inc. | Apple MacWrite |
| MW2S file extension | Apple, Inc. | MacWrite II Model |
| MW4 file extension | Activision | MechWarrior Game Structure File Archive |
| MWAV file extension | N/A | Extended WAV |
| MWB file extension | MySQL | MySQL Workbench Database Models |
| MWC file extension | Object Computing, Inc | Make Project Creator Input |
| MWD file extension | Mariner Software | Mariner Write Document Format |
| MWDP file extension | Freescale Semiconductor, Inc. | CodeWarrior Debugger |
| MWE file extension | Oracle Corporation | OpenArchitectureWare Workflow |
| MWF file extension | Autodesk | MapGuide Format |
| MWI file extension | Medlin Accounting | Medlin Payroll Software Invoice Layout Information |
| MWII file extension | Apple, Inc. | MacWrite II Text Document |
| MWK file extension | N/A | MusicWrite Music Score |
| MWLIC file extension | No Thirst Software | MoneyWell License Information Format |
| MWP file extension | IBM | Lotus Word Pro 97 Smartmaster Format |
| MWPD file extension | Apple, Inc. | MacWrite Pro Document |
| MWPP file extension | Apple, Inc. | MacWrite Pro Document |
| MWPR file extension | Apple, Inc. | MacWrite Pro |
| MWS file extension | Maplesoft | Maple Spreadsheet Document Format |
| MWT file extension | Thomson Reuters | MetaStock Stock Analysis Template |
| MWX file extension | Autodesk | Autodesk MapGuide Author Map Window XML Format |
| MX file extension | Wolfram Research | Matlab Common Matrix Routines Format |
| MX1 file extension | N/A | Coucoucircus.org Audio Temporary |
| MX2 file extension | ValuSoft | MasterCook Recipe |
| MX3 file extension | Acoustica | Mixcraft Project Format |
| MX4 file extension | Acoustica | Mixcraft 4 Audio Format |
| MX5 file extension | Acoustica | Mixcraft 5 Audio Format |
| MX5TEMPLATE file extension | Acoustica | Mixcraft Audio Project Template Format |
| MX6 file extension | Acoustica | Mixcraft 6 Audio |
| MXAD file extension | J R Oakley | Mandelbrot Explorer All Data Format |
| MXADDON file extension | Maxthon International | Maxthon Addon Format |
| MXC file extension | Esri | ArcView Geocoding Index For Read-write Coverages |
| MXC2 file extension | MAGIX | MAGIX Music Maker Cache |
| MXC3 file extension | MAGIX AG | Magix Photo Manager Thumbnail Cache |
| MXCS file extension | J R Oakley | Mandelbrot Explorer Colour Scheme Format |
| MXD file extension | ESRI | ArcGIS Map Document Format |
| MXDIC file extension | Maxthon International | Maxthon Dictionary Format |
| MXDL file extension | Maxthon International Limited | Maxthon Incomplete Download |
| MXE file extension | Insight Software Solutions | Macro Express Format |
| MXF file extension | SMPTE | Material Exchange Format |
| MXFD file extension | ABBYY | ABBYY Form |
| MXFR file extension | J R Oakley | Mandelbrot Explorer Fractal Region Format |
| MXG file extension | Mobiiko | Miinoto Exchangeable Group Format |
| MXI file extension | Adobe Systems | Adobe Dreamweaver Extension Manager Format |
| MXIT file extension | N/A | MXit Data |
| MXL file extension | The MuseScore Team | Compressed MusicXML Music Notation Format |
| MXM file extension | Next Limit | Maxwell Render Material Definition Format |
| MXMF file extension | MIDI Manufacturers Association | Mobile XMF Format |
| MXML file extension | Adobe Systems | Adobe Flex Interface Component Format |
| MXN file extension | Mobiiko | Miinoto Exchangeable Note Format |
| MXP file extension | Adobe Systems | Adobe (Macromedia) Extension Package Format |
| MXPRJ file extension | Native Instruments, Inc. | Maschine 2.0 Project |
| MXS file extension | Next Limit | Maxwell Render Scene Definition Format |
| MXSD file extension | IBM | IBM WebSphere Message Definition |
| MXSKIN file extension | Maxthon International | Maxthon Skin Format |
| MXT file extension | ESRI | ArcGIS ArcMap Map Template Format |
| MXV file extension | MAGIX | MAGIX Movie Edit Pro Video Format |
| MXZ file extension | Maximizer Software Inc. | Maximizer Data |
| MY3D file extension | N/A | My3D Tools Exported |
| MYAPP file extension | Microsoft | Microsoft Visual Studio Application XML Format |
| MYB file extension | MYOB Limited | MYOB Data |
| MYCOLORS file extension | Stardock | Stardock MyColors Theme Format |
| MYD file extension | MySQL | MySQL Database Data Format |
| MYDOCS file extension | N/A | Send To Format |
| MYE file extension | MYOB Limited | MYOB |
| MYI file extension | N/A | MySQL Database Index Format |
| MYL file extension | Avanquest Software | MyLogo Maker Image |
| MYO file extension | MYOB Limited | MYOB Data |
| MYOB file extension | MYOB Limited | MYOB Data |
| MYOX file extension | MYOB Limited | MYOB Data |
| MYP file extension | Electronic Arts, Inc. | Warhammer Online: Age Of Reckoning |
| MYR file extension | Myriad Software | Myriad Music Format |
| MYS file extension | Vineyard Technologies | Vineyard Captured Video Format |
| MYV file extension | goVivaldi Inc. | Vivaldi Studio Score |
| MZ file extension | David Webber | Mozart Compressed |
| MZ2 file extension | N/A | Maze-solver MZ2 |
| MZB file extension | N/A | MegaZeux Board |
| MZE file extension | Gregory Peatfield | Maze Creator |
| MZF file extension | N/A | MediaZip Archive |
| MZP file extension | Autodesk | Autodesk 3D Studio Max MAXScript Zip Package |
| MZT file extension | David Webber | MOZART Template |
| MZV file extension | Enliven Marketing Technologies Corporation | Viewpoint Media Player ZoomView Titles |
| MZZ file extension | Microsoft | Microsoft .NET Framework Installation Package Format |
| M_P file extension | Parametric Technology Corporation | Pro/ENGINEER Temporary |
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