| Extension |
File Type |
File Description |
| .m | Developer | Mercury Source Code File |
| .m | Developer | Objective-C Implementation File |
| .m | Data | Mathematica Input File |
| .m | Developer | MATLAB Source Code File |
| .m15 | Video | MPEG Video |
| .m1a | Audio | MPEG-1 Audio File |
| .m1pg | Video | iFinish Video Clip |
| .m1v | Video | MPEG-1 Video File |
| .m2 | Game | World or Warcraft Model Object |
| .m21 | Video | MPEG-21 File |
| .m21 | Video | AXMEDIS MPEG-21 File |
| .m2a | Video | MPEG-1 Layer 2 Audio File |
| .m2p | Plugin | Maxthon 2 Browser Plugin File |
| .m2p | Video | MPEG-2 Program Stream File |
| .m2s | Settings | Maxthon 2 Browser Skin File |
| .m2t | Video | HDV Video File |
| .m2ts | Video | Blu-ray BDAV Video File |
| .m2v | Video | MPEG-2 Video |
| .m3 | 3D Image | Blizzard MDX3 Model File |
| .m3d | 3D Image | DIALux 3D Object File |
| .m3d | 3D Image | 3D Model File |
| .m3g | Executable | Mobile 3D Graphics Program |
| .m3u | Audio | Media Playlist File |
| .m3u8 | Audio | UTF-8 M3U Playlist File |
| .m4 | Developer | Macro Processor Library |
| .m4a | Audio | MPEG-4 Audio File |
| .m4b | Audio | MPEG-4 Audio Book File |
| .m4e | Video | MPEG-4 Video File |
| .m4p | Audio | iTunes Music Store Audio File |
| .m4r | Audio | iPhone Ringtone File |
| .m4u | Video | MPEG-4 Playlist |
| .m4v | Video | iTunes Video File |
| .m75 | Video | MPEG Video |
| .ma | 3D Image | Maya Project File |
| .ma1 | Audio | Monarch Audio File |
| .mab | Misc | Mozilla Address Book |
| .mac | Raster Image | MacPaint Image |
| .macbin | Data | Macbinary Encoded File |
| .mad | Misc | Access Module Shortcut |
| .mae | Game | My Avatar Editor Character File |
| .maf | Database | Microsoft Access Form |
| .maf | Data | Mutation Annotation Format File |
| .maff | Web | Mozilla Archive Format File |
| .mag | Data | Magic Circuit Layout File |
| .mag | Misc | Access Diagram Shortcut File |
| .magik | Developer | Magik Source Code File |
| .mai | Data | Microsoft Mail File |
| .mailhost | Settings | MSN Mailhost Settings File |
| .mailplanelicense | Misc | Mailplane License File |
| .mailtoloc | Misc | Mail Internet Location File |
| .mak | Developer | Makefile |
| .make | Settings | Drush Makefile |
| .mako | Developer | Mako Template |
| .mam | Executable | Microsoft Access Macro |
| .man | Text | Unix Manual |
| .manifest | System | Windows Visual Styles File |
| .manifest | Misc | Steam Manifest File |
| .manm | Game | Vietcong Game Data File |
| .map | Game | Quake Engine Map File |
| .map | Misc | TECkit Mapping File |
| .map | GIS | NAVIGON Map File |
| .map | Data | Weather Defender Map |
| .map | GIS | Mapjects Server Webparts File |
| .map | Web | Image Map |
| .mapimail | System | Send To Mail Recipient |
| .maplet | Game | Maplet World File |
| .mapx | Web | Mapjects Client Webparts File |
| .maq | Database | Microsoft Access Query |
| .mar | Misc | Mozilla Archive |
| .mar | Spreadsheet | Mariner Calc Spreadsheet |
| .mar | Database | Microsoft Access Report |
| .markdn | Developer | Markdown File |
| .markdown | Developer | Markdown Documentation File |
| .mars | Page Layout | Adobe MARS File |
| .marshal | Database | Marshal Data Migration Model File |
| .mart | Data | MartView eBook File |
| .mas | Data | MEGA Alignment Sequence File |
| .mas | Database | Access Stored Procedures |
| .mas | Game | rFactor Track File |
| .masseffectprofile | Game | Mass Effect Player Profile |
| .masseffectsave | Game | Mass Effect Saved Game |
| .master | Web | ASP.NET Master Page |
| .mat | Raster Image | Vue Material File |
| .mat | Data | MATLAB MAT-File |
| .mat | Misc | Microsoft Access Table Shortcut File |
| .mat | 3D Image | 3ds Max Materials File |
| .mat | Plugin | V-Ray Materials File |
| .material | Settings | Rigs of Rods Texture Reference File |
| .mato | Game | Atomic Combat Saved Game |
| .mau | Misc | Media Attachment Unit |
| .mav | Database | Access View File |
| .maw | Database | Access Data Access Page |
| .max | 3D Image | 3ds Max Scene File |
| .max | Raster Image | PaperPort Scanned Document |
| .max | Game | Action Replay Max Save File |
| .max | Page Layout | OmniPage Scanned Document |
| .maxc | 3D Image | 3ds Max Container File |
| .mb | 3D Image | Maya Binary Project File |
| .mbb | Misc | Kodak EasyShare Data File |
| .mbb | Data | ManaBook Book File |
| .mbbk | Page Layout | ManaBook Book Kit File |
| .mbd | Data | Multimedia Builder Project File |
| .mbf | Data | Microsoft Money Backup File |
| .mbg | Data | Mailbag Assistant Mailbox File |
| .mbg | Data | Microsoft Mailbag |
| .mbi | Disk Image | Multi-Bootable Information File |
| .mbl | Data | Logger Pro Data File |
| .mbm | Raster Image | Multi Bitmap File |
| .mbox | Text | E-mail Mailbox File |
| .mbp | Data | Mobipocket Notes File |
| .mbr | System | Master Boot Record File |
| .mbr | Audio | Zune Smooth Streaming File |
| .mbs | Misc | Opera Mailbox File |
| .mbw | Backup | MBRWizard Archive |
| .mbx | Data | Outlook Express Mailbox |
| .mc1 | Data | MedCalc Data File |
| .mc2 | Misc | MasterCook 5 Cookbook File |
| .mc5 | 3D Image | Poser 5 Material File |
| .mc6 | 3D Image | Poser 6 Material File |
| .mc9 | CAD | Mastercam 9 Geometry File |
| .mcd | CAD | MiniCAD Design File |
| .mcd | Data | Mathcad Document |
| .mcf | Font | Watchtower Library Font File |
| .mcf | Misc | MasterCook 2 Cookbook File |
| .mcfi | Misc | Maya Initial Fluid Cache File |
| .mcfp | Misc | Maya Fluid Cache Playback File |
| .mcgame | Game | Minecraft Game Backup File |
| .mci | Misc | Media Control Interface File |
| .mcl | Settings | Windows Media Center Link File |
| .mclevel | Game | Minecraft Map File |
| .mco | Misc | Live Messenger Winks File |
| .mcp | Developer | CodeWarrior Project |
| .mcr | Game | ePSXe Memory Card File |
| .mcr | Executable | Tecplot Macro |
| .mcr | Game | Minecraft Region File |
| .mcr | Executable | 3ds Max Macroscript File |
| .mcrp | Encoded | MobyExplorer Encrypted File |
| .mcs | Raster Image | Mathcad Image |
| .mcw | Settings | Monitor Calibration Wizard File |
| .mcworld | Game | Minecraft World Backup File |
| .mcx | CAD | MICRO CADAM-X/6000 Model Data File |
| .mcxe | Data | MedicinesComplete Data File |
| .mcz | 3D Image | Compressed Poser Material File |
| .md | Game | SEGA Mega Drive ROM |
| .md | Developer | Markdown Documentation File |
| .md | Game | Sharkport Saved Game File |
| .md | Developer | Machine Description File |
| .md | Compressed | MDCD Compressed Archive |
| .md | Data | Moneydance Financial Data File |
| .md0 | Misc | Adobe Photoshop Metadata Cache File |
| .md0 | Disk Image | Alcohol Disk Image Segment 1 |
| .md1 | Disk Image | GEAR CD/DVD Disc Image |
| .md1 | Disk Image | Alcohol Disk Image Segment 2 |
| .md2 | Game | Quake 2 Player Model |
| .md2 | Disk Image | Alcohol Disk Image Segment 2 |
| .md3 | Game | Quake 3 3D Model |
| .md5 | Misc | MD5 Checksum File |
| .md5anim | 3D Image | id Tech 4 Model Animation File |
| .md5camera | 3D Image | id Tech 4 Model Camera File |
| .md5mesh | 3D Image | id Tech 4 3D Mesh File |
| .md8 | Data | GarageCUBE Modul8 Project |
| .md8 | Data | Mediator Project File |
| .mda | Plugin | Access Add-in |
| .mdb | Data | Avid Media Database |
| .mdb | Database | Microsoft Access Database |
| .mdbackup | Backup | iPhone Data Backup File |
| .mdbhtml | Database | Microsoft Access Database HTML File |
| .mdc | GIS | Merkaartor Document |
| .mdc | Data | Multi Dimension Cube File |
| .mddata | Backup | iPhone Backup File |
| .mde | Plugin | ArchiCAD Educational Version Module File |
| .mde | Plugin | Compiled Access Add-in File |
| .mdf | Misc | Translation Memory Data Find File |
| .mdf | Data | Measurement Data Format File |
| .mdf | Database | SQL Server Database File |
| .mdf | Disk Image | Media Disc Image File |
| .mdi | Page Layout | Microsoft Document Imaging File |
| .mdinfo | Backup | iPhone Backup Information File |
| .mdl | Audio | DigiTrakker Module |
| .mdl | Data | Simulink Model File |
| .mdl | CAD | Lectra Modaris Clothing Design File |
| .mdl | Game | Half-Life Model File |
| .mdl | 3D Image | Warcraft 3 3D Model Text File |
| .mdl | Misc | Flight Simulator Airplane Model |
| .mdl | Data | Rational Rose Model File |
| .mdm | Game | Mario Dash Map File |
| .mdm | Data | HLM Multivariate Data Matrix File |
| .mdmp | System | Windows Minidump |
| .mdn | Database | Blank Access Database Template |
| .mdown | Developer | Markdown File |
| .mdp | Settings | Visual C++ 5 Workspace File |
| .mds | Disk Image | Media Descriptor File |
| .mdt | Database | GeoMedia Access Database Template |
| .mdt | Data | Microsoft Access Data File |
| .mdw | Misc | Access Workgroup File |
| .mdx | Data | Rational XDE Model File |
| .mdx | 3D Image | Warcraft 3 Model File |
| .mdx | Disk Image | Extended Media Descriptor File |
| .mdx | Data | Multiple Index File |
| .mdz | Data | Access Wizard Template |
| .me | Text | Readme Text File |
| .me2mod | Game | Mass Effect 2 Modification File |
| .meb | 3D Image | PRO100 3D Interior Catalog Element |
| .med | Developer | RSView Development Project |
| .med | Audio | Amiga MED Sound File |
| .mef | Raster Image | Mamiya RAW Image |
| .meg | Data | MEGA Data File |
| .mel | Executable | Maya Embedded Language File |
| .mell | Text | Mellel Word Processing File |
| .mellel | Text | Mellel Word Processing Document |
| .mem | Game | Virtual Game Station Memory File |
| .mem | System | Parallels Desktop Memory Dump File |
| .mem | Data | Mnemosyne Card Collection |
| .mem | Executable | Macro Editor Macro |
| .mem | Backup | FoxPro Variable File |
| .menc | Data | Windows Mobile Encrypted File |
| .menu | Game | Quake 3 Engine Menu File |
| .mer | Developer | RSView Development Runtime File |
| .merlin2 | Data | Merlin Project File |
| .merlinlicense | Misc | Merlin License File |
| .mesh | 3D Image | 3D Mesh Model |
| .mesh | 3D Image | DirectX Mesh File |
| .met | Raster Image | Presentation Manager Metafile |
| .met | Data | eMule Resource File |
| .meta | Video | RealPlayer Metafile |
| .metadata_never_index | System | Spotlight Never Index File |
| .mex | Data | Macro Express File |
| .mf | Developer | Java Manifest File |
| .mf | Font | METAFONT File |
| .mfa | Data | MobileFrame App File |
| .mfa | Developer | Multimedia Fusion Development File |
| .mfe | Data | MobileFrame Enterprise Data File |
| .mfl | Data | Mozilla FastLoad File |
| .mfo | Data | MobileFrame Object File |
| .mfo | Page Layout | MediaFace Online Saved File |
| .mfo | Data | Perl ModInfo Descriptor File |
| .mfp | Data | Macromedia FlashPaper Document |
| .mfp | Data | MobileFrame Package |
| .mfp | Page Layout | MediaFACE Project File |
| .mfs | Encoded | MetFS Encrypted File System |
| .mft | Data | Kaspersky File Table |
| .mft | Page Layout | MediaFACE Project Template |
| .mfu | Data | MobileFrame Update File |
| .mfv | Data | MobileFrame Device Pack File |
| .mfw | Plugin | MobileFrame Workflow Pack File |
| .mfx | Plugin | Multimedia Fusion Extension |
| .mga | Page Layout | Manga Document |
| .mgc | Vector Image | Microsoft Clip Organizer Media Catalog |
| .mgc | Data | MGCSoft Equation Illustrator File |
| .mgcb | Vector Image | Equation Illustrator Project File |
| .mgdatabase | Misc | MacGourmet Deluxe Database File |
| .mgf | 3D Image | Materials and Geometry Format |
| .mgl | Game | Age of Empires 2 Replay File |
| .mgm | Settings | MGCSoft Equation Illustrator Macro |
| .mgmf | Vector Image | MindGenius Map File |
| .mgmt | Vector Image | MindGenius 2-3 Template |
| .mgmx | Vector Image | MindGenius XML Map File |
| .mgo | Misc | MacGourmet Recipe File |
| .mgs | Vector Image | MGCSoft Vector Shapes File |
| .mgt | Misc | Musicnotes Guitar Guru Song File |
| .mgtheme | Settings | MacGourmet Theme File |
| .mgtx | Vector Image | MindGenius XML Template File |
| .mgv | Video | PSP Video File |
| .mgv | Audio | Yamaha MegaVoice File |
| .mgx | Game | Age of Empires 2 Expansion Replay File |
| .mgx | Game | Rise of Nations Saved Game |
| .mhp | Data | Maths Helper Plus File |
| .mhs | CAD | Xilinx XPS Hardware Specification File |
| .mht | Web | MHTML Web Archive |
| .mhtml | Web | MIME HTML File |
| .mi4 | System | Audio Player Firmware File |
| .mic | Raster Image | Image Composer File |
| .mid | GIS | MapInfo Data File |
| .mid | Audio | MIDI File |
| .midi | Audio | MIDI File |
| .mif | GIS | MapInfo Interchange Format File |
| .mif | Page Layout | FrameMaker Interchange Format File |
| .mif | Misc | Management Information Format |
| .mig | Backup | Windows Migration Backup File |
| .mii | Game | Wii Virtual Avatar File |
| .milk | Plugin | MilkDrop Winamp Plugin Preset |
| .mim | Encoded | Multi-Purpose Internet Mail Message File |
| .mime | Encoded | Multi-Purpose Internet Mail Extension |
| .mindnode | Data | MindNode Document |
| .mine | Game | Minecraft Map File |
| .minesweepersave-ms | Game | Minesweeper Saved Game |
| .miniusf | Audio | Nintendo 64 Song File |
| .mint | Compressed | Linux Mint Installer File |
| .mio | Executable | MioEngine Application File |
| .mip | Raster Image | Multiple Image Print File |
| .mir | Disk Image | Mini-Image Ripper Disc Image |
| .mis | Game | Marble Blast Gold Mission File |
| .mis | Game | Saved Game Mission File |
| .mission | Game | Vega Strike Mission File |
| .mission | Data | MissionMaker Project File |
| .mit | Data | MineEdit Inventory Template File |
| .mix | Game | Command & Conquer Data File |
| .mix | Raster Image | Microsoft Image Exchange File |
| .mix | 3D Image | 3ds Max Motion Mixer File |
| .mj2 | Video | Motion JPEG 2000 Video Clip |
| .mjd | Encoded | Adobe Acrobat MIME Encoded Job Definition File |
| .mjdoc | Misc | MacJournal Document |
| .mjp | Video | MJPEG Video File |
| .mjpg | Video | Motion JPEG Video File |
| .mk | Developer | Makefile |
| .mka | Audio | Matroska Audio File |
| .mkv | Video | Matroska Video File |
| .ml | Developer | ML Source Code File |
| .mlb | Developer | Visual FoxPro Library |
| .mlc | System | Microsoft Language Interface Pack |
| .mlk | Settings | Mastercook Look File |
| .mlp | Audio | Meridian Lossless Packing Audio File |
| .mls | Data | Milestones Simplicity File |
| .mls | Misc | CrystalPlayer Playlist |
| .mm | Developer | Objective-C++ Source File |
| .mm | Data | FreeMind Mind Map |
| .mm6 | Game | Might and Magic 6 Saved Game |
| .mm6 | Data | Money Manager 6 File |
| .mm7 | Game | Might and Magic 7 Saved Game |
| .mm8 | Game | Might and Magic 8 Saved Game |
| .mma | Data | Master Album Maker Photo Album File |
| .mmap | Data | MindManager Map File |
| .mmat | Vector Image | MindManager Map Template |
| .mmc | Data | Microsoft Media Catalog |
| .mmdc | Settings | MediaMonkey Device Configuration File |
| .mme | Encoded | Multi-Purpose Internet Mail |
| .mmf | Audio | Synthetic Music Mobile Application File |
| .mmf | Data | Microsoft Message File |
| .mmip | Plugin | MediaMonkey Installation Package |
| .mml | Data | Microsoft Clip Organizer File |
| .mml | Page Layout | FrameMaker Maker Markup Language File |
| .mmm | Data | Money Manager File |
| .mmm | Audio | Music Maker Arrangement File |
| .mmo | Misc | Memory Map Overlay File |
| .mmp | Data | Master Album Maker Project |
| .mmp | Audio | MixMeister Playlist |
| .mmp | Data | MindManager Mind Map |
| .mmp | Settings | Symbian Project Specification File |
| .mmu | Data | myPM Merge Data File |
| .mmv | Video | MicroMV Video File |
| .mmw | Data | Microsoft Clip Organizer Media Catalog File |
| .mmw | Data | AceMoney Money File |
| .mnc | Encoded | AutoCAD Compiled Menu File |
| .mnc | Data | My Notes Center Notebook |
| .mng | Data | Yamaha PSR Disk Manager File |
| .mng | Raster Image | Multiple Network Graphic |
| .mnh | GIS | Master Navigator Header File |
| .mnk | Data | My Notes Keeper Notebook |
| .mnl | Misc | AutoCAD Menu LISP File |
| .mnm | 3D Image | Character Studio Marker Name File |
| .mno | Data | Macromedia Design Note |
| .mnr | Raster Image | AutoCAD Menu Resource File |
| .mns | Settings | AutoCAD Interface Settings File |
| .mnt | Text | FoxPro Menu Memo |
| .mnu | Settings | AutoCAD Interface Layout File |
| .mnu | Settings | Adobe Photoshop Menu Customization File |
| .mnu | Settings | TomTom Menu File |
| .mnv | Video | PlayStation Movie File |
| .mnx | Misc | FoxPro Menu |
| .mny | Data | Microsoft Money File |
| .mo | Developer | Machine Object File |
| .mo3 | Audio | MO3 Audio File |
| .mob | Video | MOBTV Video File |
| .mobi | Data | Mobipocket eBook |
| .mobileconfig | System | Apple Mobile Configuration File |
| .mobileprovision | Misc | Xcode Mobile Provisioning Profile |
| .mod | Game | Neverwinter Nights Module |
| .mod | Plugin | ArchiCAD Module |
| .mod | Developer | Fortran Module File |
| .mod | Audio | Amiga Music Module File |
| .mod | Video | Camcorder Recorded Video File |
| .modd | Video | Sony Video Analysis File |
| .model | CAD | CATIA 3D Model FIle |
| .mof | Settings | Managed Object Format File |
| .moff | Video | Sony Video Analysis Index File |
| .moho | Data | Anime Studio Animation Project |
| .moi | Video | MOI Video File |
| .mol | Data | MDL Molfile |
| .mom | Developer | Managed Object Model |
| .money | Data | Money Data File |
| .montage | Misc | Montage Screenplay File |
| .moov | Video | Apple QuickTime Movie |
| .mos | Raster Image | Leaf Camera RAW File |
| .mosaic | Data | MacOSaiX Mosaic File |
| .mot | 3D Image | LightWave Motion File |
| .mou | Compressed | WinMount Compressed File |
| .mov | Video | Apple QuickTime Movie |
| .movie | Video | QuickTime Movie File |
| .mox | Data | ExtendSim Simulation Software Model |
| .moz | Web | Mozilla Cache File |
| .mp | 3D Image | Maya PLE Project File |
| .mp | Vector Image | LaTeX MetaPost File |
| .mp1 | Audio | MPEG-1 Layer 1 Audio File |
| .mp10 | CAD | Multisim 10 Project File |
| .mp11 | CAD | Multisim 11 Project File |
| .mp2 | Audio | MPEG Layer II Compressed Audio File |
| .mp21 | Video | MPEG-21 Multimedia File |
| .mp21 | Video | AXMEDIS MPEG-21 Object |
| .mp2m | Game | Max Payne 2 Mod File |
| .mp2s | Game | Max Payne 2 Saved Game |
| .mp2v | Video | MPEG-2 Video File |
| .mp3 | Audio | MP3 Audio File |
| .mp4 | Video | MPEG-4 Video File |
| .mp4v | Video | MPEG-4 Video |
| .mp7 | CAD | Multisim 7 Project File |
| .mp9 | CAD | Multisim 9 Project File |
| .mpa | Audio | MPEG-2 Audio File |
| .mpb | Backup | MyPhoneExplorer Backup File |
| .mpc | Audio | Musepack Compressed Audio File |
| .mpcpl | Misc | Media Player Classic Playlist |
| .mpd | Database | Microsoft Project Database |
| .mpd | Data | File List Creator Playlist |
| .mpdconf | Settings | Music Player Daemon File |
| .mpe | Video | MPEG Movie File |
| .mpeg | Video | MPEG Movie |
| .mpeg4 | Video | MPEG-4 File |
| .mpf | Raster Image | Microsoft Media Package FIle |
| .mpf | Video | MainActor Project File |
| .mpg | Video | MPEG Video File |
| .mpg2 | Video | MPEG-2 Video File |
| .mpga | Audio | MPEG-1 Layer 3 Audio File |
| .mpgindex | Video | Adobe MPEG Index File |
| .mpi | Data | InstallJammer Project File |
| .mpj | Data | Minitab Project File |
| .mpj | Data | RoboHelp HTML Project |
| .mpk | GIS | ArcGIS Map Package |
| .mpk | Game | Project64 Memory Pack File |
| .mpkg | Compressed | Meta Package File |
| .mpl | Video | AVCHD Playlist File |
| .mpls | Video | Blu-ray Movie Playlist File |
| .mpm | Game | Max Payne Modfication File |
| .mpo | Raster Image | Multi Picture Object File |
| .mpp | Data | Microsoft Project File |
| .mpp | Data | MobileFrame Project Publisher File |
| .mpq | Game | Blizzard Mo'PaQ File |
| .mpr | Developer | FoxPro Generated Menu Program |
| .mpr | Data | FileMaker Dictionary File |
| .mps | GIS | Pocket Streets Map File |
| .mps | Data | Mathematical Programming System File |
| .mps | Game | Max Payne Saved Game |
| .mpsub | Video | MPlayer Subtitles File |
| .mpt | Data | Microsoft Project Template |
| .mpu | Audio | MPEG Layer 3 Audio File |
| .mpv | Video | MPEG Elementary Stream Video File |
| .mpv2 | Video | MPEG-2 Video Stream |
| .mpw | Settings | Microsoft Project Workspace File |
| .mpx | Executable | FoxPro Compiled Menu Program |
| .mpx | Data | Microsoft Project Exchange File |
| .mpz | Data | Miradi Project File |
| .mpz | Game | Red Eclipse Map File |
| .mpzip | Data | Multisim Pack File |
| .mp_ | Audio | Mobile Phone Sound File |
| .mq4 | Data | MetaTrader Custom Indicator |
| .mqv | Video | Sony Movie Format File |
| .mrb | Raster Image | Multiple Resolution Bitmap File |
| .mrc | Executable | mIRC Script File |
| .mrg | Database | MySQL Merge File |
| .mrimg | Disk Image | Macrium Reflect Disk Image |
| .mrk | Misc | DPOF Auto Print Order File |
| .mrml | 3D Image | 3D Slicer Scene Description File |
| .mrs | Game | GunZ Game Data File |
| .mrt | Developer | Stimulsoft Report File |
| .mrw | Raster Image | Minolta Raw Image File |
| .mrxs | Raster Image | MIRAX Virtual Slide File |
| .ms | Executable | 3ds Max Script File |
| .ms | Executable | Maxwell Script |
| .ms-tnef | Misc | MS Transport Neutral Encapsulation Format |
| .ms1 | Game | VirtualBus Map File |
| .ms10 | Data | Multisim 10 Circuit Design File |
| .ms11 | CAD | Multisim 11 Circuit Design File |
| .ms3d | 3D Image | MilkShape 3D Model |
| .ms7 | CAD | Multisim 7 Circuit Design File |
| .ms8 | Data | Multisim 8 Circuit Design File |
| .ms9 | CAD | Multisim 9 Circuit Design File |
| .msb | Data | Oracle Binary Message File |
| .msc | Data | MuseScore Composition File |
| .msc | System | Microsoft Management Console Snap-in Control File |
| .mscx | Audio | MuseScore Music Score File |
| .mscz | Audio | MuseScore Compressed Score File |
| .msd | GIS | Map Service Definition File |
| .msdvd | Video | Windows DVD Maker Project File |
| .mse | Encoded | 3ds Max Encrypted MAXScript File |
| .msf | Misc | Mail Summary File |
| .msf | Settings | Miranda IM Skin File |
| .msg | Text | Outlook Mail Message |
| .msh | 3D Image | Orbiter 3D Mesh File |
| .msh | Video | Visual Communicator Project File |
| .msi | Misc | Windows Installer Package |
| .msk | Raster Image | Paint Shop Pro Mask File |
| .mskn | Settings | MediaMonkey Skin File |
| .msm | Settings | Windows Installer Merge Module |
| .msn | Settings | Host Blocking File |
| .mso | Misc | Inline E-mail Attachment |
| .mso | Misc | Microsoft Office Macro Reference File |
| .msp | System | Windows Installer Patch |
| .msp | Data | ClarisWorks Dictionary File |
| .msp | Developer | MaxScript Page File |
| .msp | Raster Image | Microsoft Paint Bitmap Image |
| .mspx | Web | Microsoft ASP.NET Web Page |
| .msrcincident | Misc | Windows Remote Assistance Invitation File |
| .mss | Data | MyScreenSaver Builder File |
| .mss | Developer | Microprocessor Software Specification File |
| .msstyle | System | Windows XP Unsigned Style |
| .msstyles | System | Windows XP Style |
| .mst | Settings | Windows Installer Setup Transform File |
| .mst | Settings | Corel Presentations Master Template File |
| .msu | Misc | Windows Vista Update Package |
| .msv | Audio | Memory Stick Voice File |
| .msw | Settings | Painter Color Mixer Swatches File |
| .mswmm | Video | Windows Movie Maker Project |
| .mt2 | Audio | MadTracker 2 Module |
| .mt9 | Audio | MT9 Audio File |
| .mta | Misc | Samsung AllShare Metadata File |
| .mtd | Misc | Musicnotes Digital Sheet Music File |
| .mte | Audio | MadTracker 2 Envelope |
| .mtf | Misc | Translation Memory Translations File |
| .mtf | Audio | Multi Tracker File |
| .mtf | Data | Mortality Table File |
| .mtf | Misc | MasterCook Tips |
| .mtf | Settings | Motorola Theme File |
| .mth | Data | Derive Math File |
| .mti | Audio | MadTracker Instrument |
| .mtl | 3D Image | OBJ Material File |
| .mtm | Audio | MultiTracker Module |
| .mtm | Data | Macrofocus TreeMap File |
| .mtp | Audio | MadTracker 2 Pattern |
| .mts | Audio | MadTracker 2 Sample File |
| .mts | Video | AVCHD Video File |
| .mts | Data | MEGA Tree Session File |
| .mtt | Data | MetadataTouch Template |
| .mtv | Video | MTV Video Format File |
| .mtw | Data | Minitab Worksheet File |
| .mtx | Plugin | MadTracker 2 Extension |
| .mtx | 3D Image | MetaStream Scene File |
| .mtz | 3D Image | Compressed MetaStream Scene File |
| .mud | Database | Textease Multi User Database |
| .muf | Data | Alpha Five Licence File |
| .mui | System | Multilingual User Interface File |
| .mum | System | Windows Vista Update Package |
| .mup | Data | Music Publisher Score |
| .mus | Game | Electronic Arts Game Music File |
| .mus | Audio | Finale Notation File Format |
| .musa | Audio | Aleph One Music File |
| .mv | Developer | MivaScript File |
| .mvb | Video | Multimedia Viewer Book Source File |
| .mvc | Video | Movie Collector Catalog |
| .mvc | Web | MivaScript Compiled File |
| .mvd | Video | Movie Edit Pro Movie File |
| .mve | Video | Infinity Engine Movie File |
| .mvi | Misc | AutoCAD Movie Command File |
| .mvp | Video | MoviePlus Project File |
| .mvp | Video | Movie Edit Pro Video Project File |
| .mvr | Web | IBM HotMedia Multimedia File |
| .mvs | CAD | Microchip Verification Specification File |
| .mvx | Developer | Multimedia Fusion Movement Extension |
| .mvy | Video | Video easy Project File |
| .mv_ | Backup | Movie Edit Pro Movie Backup File |
| .mw | Data | Maple Worksheet |
| .mw | Text | MacWrite Text Document |
| .mwb | Database | MySQL Workbench Document |
| .mwd | Text | MarinerWrite Document |
| .mwf | Data | MapGuide Author Map Window File |
| .mwf | Misc | Translation Memory Word Find File |
| .mwp | Text | Lotus Word Pro SmartMaster File |
| .mws | Audio | MWave DSP Synth Instrument Extract |
| .mws | Data | Maple Classic Worksheet |
| .mwx | Data | MicroWorlds EX File |
| .mwx | GIS | MapGuide Author Map Window XML File |
| .mx | Data | Mathematica Serialized Package File |
| .mxad | Data | Mandelbrot Explorer All Data File |
| .mxaddon | Plugin | Maxthon Add-On File |
| .mxc2 | Data | MAGIX Cache File |
| .mxcs | Settings | Mandelbrot Explorer Color Scheme File |
| .mxd | GIS | ArcGIS Map Document |
| .mxe | Executable | Macro Express Playable Macro |
| .mxf | Font | Maxis Font File |
| .mxf | Video | Material Exchange Format File |
| .mxfr | Settings | Mandelbrot Explorer Fractal Region File |
| .mxi | Raster Image | Maxwell Image |
| .mxi | Data | Adobe Extension Information File |
| .mxl | Audio | Compressed MusicXML File |
| .mxm | 3D Image | Maxwell Material File |
| .mxmf | Audio | Mobile XMF Ringtone File |
| .mxml | Developer | Flex MXML Component |
| .mxn | Misc | Miinoto Exchangeable Note File |
| .mxp | Plugin | Adobe Extension Package |
| .mxs | 3D Image | Maxwell Studio Scene File |
| .mxs | Settings | Painter Color Mixer Pad File |
| .mxskin | Settings | Maxthon Skin File |
| .mxt | GIS | ArcGIS Map Template |
| .myapp | Developer | Visual Studio Application XML File |
| .mycolors | Settings | Stardock MyColors Theme File |
| .myd | Database | MySQL Database Data File |
| .mydocs | System | Send To My Documents |
| .myi | Data | MySQL MyISAM Index File |
| .mys | Video | Vineyard Captured Video File |
| .mzp | Compressed | MAXScript Zip Package |
| .mzp | Audio | Mozart Percussion File |
| .mzp | Compressed | WinArchiver Mountable Archive |
| .mzz | Misc | Microsoft .NET Download Package |
