M File Extensions
Browse file types with extensions beginning with M.
| Extension | File Type | Popularity |
|---|---|---|
| .M | Objective-C Implementation File | 3.6 |
| .M | Wolfram Mathematica Language Package | 3.1 |
| .M | MATLAB Source Code File | 3.4 |
| .M1PG | iFinish Video Clip | 2.7 |
| .M2 | World of Warcraft Model Object | 3.9 |
| .M21 | MPEG-21 File | 3.0 |
| .M21 | AXMEDIS MPEG-21 File | 3.0 |
| .M2P | MPEG-2 Program Stream File | 3.3 |
| .M2P | Maxthon 2 Browser Plugin File | 2.5 |
| .M2S | Maxthon 2 Browser Skin File | 4.0 |
| .M2TS | Blu-ray BDAV Video File | 3.5 |
| .M2V | MPEG-2 Video | 3.0 |
| .M3 | Blizzard MDX3 Model File | 2.9 |
| .M3U | M3U Media Playlist | 3.7 |
| .M3U8 | UTF-8 M3U Playlist | 3.7 |
| .M3UP | M3U Playlist (UTF-8) | 4.0 |
| .M4 | Macro Processor Library | 3.3 |
| .M4A | MPEG-4 Audio | 3.7 |
| .M4B | MPEG-4 Audiobook | 3.5 |
| .M4P | iTunes Music Store Audio File | 3.3 |
| .M4R | iPhone Ringtone | 4.0 |
| .M4S | MPEG-DASH Video Segment | 3.8 |
| .M4V | iTunes Video File | 3.6 |
| .M5P | MachFive Preset File | 3.0 |
| .MA | Maya ASCII Scene | 4.0 |
| .MAAS | MAAS Ransomware Encrypted File | 3.0 |
| .MAB | Mozilla Address Book | 3.3 |
| .MAE | My Avatar Editor Character File | 4.4 |
| .MAF | Mutation Annotation Format File | 2.8 |
| .MAFF | Mozilla Archive Format File | 3.3 |
| .MAGIK | Magik Source Code File | 2.0 |
| .MAHJONGTITANSSAVE-MS | Mahjong Titans Saved Game | 4.0 |
| .MAI | Microsoft Mail File | 3.8 |
| .MAILHOST | MSN Mailhost Settings File | 3.0 |
| .MAILSTATIONERY | Apple Mail Stationery File | 3.0 |
| .MAILTOLOC | Mail Internet Location File | 2.0 |
| .MAK | Makefile | 3.6 |
| .MAKERBOT | MakerBot Print File | 4.3 |
| .MANI | Mine-imator Project File | 3.7 |
| .MANIFEST | Windows Application Manifest File | 4.1 |
| .MAP | Quake Engine Game Map | 3.9 |
| .MAP | TECkit Mapping File | 2.4 |
| .MAP | Halo Map File | 3.6 |
| .MAPIMAIL | Send To Mail Recipient | 4.0 |
| .MAPLET | Maplet World File | 3.0 |
| .MAQ | Microsoft Access Query | 3.3 |
| .MAR | Mozilla Archive | 3.6 |
| .MARKDOWN | Markdown Documentation File | 3.6 |
| .MARSHAL | Marshal Data Migration Model File | 4.0 |
| .MART | MartView eBook File | 4.5 |
| .MAS | rFactor Track File | 3.9 |
| .MASK | SpeedGrade Color Mask File | 2.0 |
| .MASSEFFECTPROFILE | Mass Effect Player Profile | 3.0 |
| .MASSEFFECTSAVE | Mass Effect Saved Game | 4.0 |
| .MAT | 3ds Max Materials File | 2.8 |
| .MAT | MATLAB MAT-file | 2.9 |
| .MAT | Vue Material File | 2.4 |
| .MATERIAL | Godot Engine Material | 4.0 |
| .MATERIAL | OGRE Material Script | 3.0 |
| .MAV | Access View File | 3.6 |
| .MAX | 3ds Max Scene File | 3.4 |
| .MAX | PaperPort Scanned Document | 3.1 |
| .MAX | OmniPage Scanned Document | 3.5 |
| .MAXC | 3ds Max Container File | 3.3 |
| .MB | Maya Binary Scene | 3.8 |
| .MBA | MailNavigator Mail Box Archive | 3.0 |
| .MBD | Multimedia Builder Project File | 4.0 |
| .MBF | Microsoft Money Backup File | 3.8 |
| .MBG | Mailbag Assistant Mailbox File | 2.0 |
| .MBG | Microsoft Mailbag | 3.6 |
| .MBI | Multi-Bootable Information File | 4.0 |
| .MBM | Multi Bitmap File | 3.0 |
| .MBOX | Email Mailbox | 3.4 |
| .MBP | Mobipocket Notes File | 3.5 |
| .MBP | MediaShow Burning Project File | 3.0 |
| .MBR | Zune Smooth Streaming File | 3.5 |
| .MBS | Opera Mailbox File | 2.5 |
| .MBTILES | Mapbox Tileset | 3.5 |
| .MBW | Mine Blocks World | 4.3 |
| .MBWB | Mine Blocks Worlds and Settings Backup | 3.0 |
| .MBX | Outlook Express Mailbox | 2.7 |
| .MC1 | MedCalc Data File | 3.0 |
| .MC2 | MasterCook 5 Cookbook File | 3.0 |
| .MC5 | Poser 5 Material File | 4.3 |
| .MC6 | Poser Material Collection File | 3.0 |
| .MC9 | Mastercam 9 Geometry File | 4.2 |
| .MCA | Minecraft Anvil Region | 4.4 |
| .MCAPM | Minecraft Anvil PocketMine Data File | 3.6 |
| .MCAT | Adobe Lightroom Catalog | 2.8 |
| .MCD | Mathcad Document | 2.9 |
| .MCD | MiniCAD Design File | 3.5 |
| .MCDX | Mathcad Prime Document | 2.9 |
| .MCF | MARS Component File | 3.0 |
| .MCL | Windows Media Center Link File | 3.9 |
| .MCMAC | MasterCook Mac Document | 2.5 |
| .MCO | Live Messenger Winks File | 2.8 |
| .MCP | CodeWarrior Project | 3.5 |
| .MCPACK | Minecraft Bedrock Edition Add-On | 4.1 |
| .MCR | 3ds Max Macroscript File | 3.4 |
| .MCR | Minecraft Region File | 4.3 |
| .MCSERVER | Minecraft Server File | 4.1 |
| .MCSP | My Craft Studio Project File | 4.0 |
| .MCSTRUCTURE | Minecraft Structure | 4.3 |
| .MCWORLD | Minecraft World Backup | 4.3 |
| .MCX | MICRO CADAM-X/6000 Model Data File | 4.3 |
| .MCZ | Compressed Poser Material File | 3.6 |
| .MD | Markdown Documentation File | 4.0 |
| .MD | MuseData Musical Score | 3.3 |
| .MD | Moneydance Financial Data File | 2.2 |
| .MD0 | Alcohol Disk Image Segment 1 | 3.9 |
| .MD1 | Alcohol Disk Image Segment 2 | 3.0 |
| .MD2 | Quake 2 3D Model | 4.0 |
| .MD2 | Alcohol Disk Image Segment 2 | 2.8 |
| .MD3 | Quake 3 3D Model | 3.5 |
| .MD5 | MD5 Checksum File | 3.8 |
| .MD5.TXT | Message Digest 5 Hash File | 3.5 |
| .MD5ANIM | id Tech 4 Model Animation File | 4.3 |
| .MD5CAMERA | id Tech 4 Model Camera File | 4.0 |
| .MD5MESH | id Tech 4 3D Mesh File | 4.0 |
| .MD8 | Mediator Project File | 2.5 |
| .MDA | Access Add-in | 4.1 |
| .MDB | Microsoft Access Database | 3.7 |
| .MDB | Avid Media Database | 2.6 |
| .MDBACKUP | iPhone Data Backup File | 2.8 |
| .MDC | Multi Dimension Cube File | 2.8 |
| .MDC | MidiCo Karaoke Audio File | 3.3 |
| .MDC | Merkaartor Document | 3.0 |
| .MDD | Point Oven Deformation Data File | 3.7 |
| .MDDATA | iPhone Backup File | 4.0 |
| .MDE | Compiled Access Add-in File | 4.1 |
| .MDF | Media Disc Image File | 4.0 |
| .MDF | SQL Server Database | 4.1 |
| .MDF | Measurement Data Format File | 3.9 |
| .MDF | Translation Memory Data Find File | 3.5 |
| .MDI | Microsoft Document Imaging File | 3.4 |
| .MDINFO | iPhone Backup Information File | 3.7 |
| .MDJ | StarUML Model File | 3.1 |
| .MDL | MathWorks Simulink Model | 4.2 |
| .MDL | Half-Life Model File | 4.1 |
| .MDL | Flight Simulator Airplane Model | 3.8 |
| .MDL | Rational Rose Model File | 3.7 |
| .MDL | Warcraft 3 3D Model Text File | 4.2 |
| .MDM | HLM Multivariate Data Matrix File | 3.2 |
| .MDMP | Windows Minidump | 4.2 |
| .MDP | FireAlpaca Image | 3.8 |
| .MDR | ModPlug Compressed Module | 3.5 |
| .MDS | Media Descriptor Sidecar File | 4.1 |
| .MDS | TestComplete Project File | 4.0 |
| .MDSX | MEGA Saved Session | 3.2 |
| .MDW | Access Workgroup | 3.7 |
| .MDX | Extended Media Descriptor File | 3.9 |
| .MDX | Warcraft 3 Model File | 4.1 |
| .MDZIP | MagicDraw Project Archive | 3.0 |
| .MEB | PRO100 3D Interior Catalog Element | 3.8 |
| .MED | Amiga MED Sound File | 3.6 |
| .MEF | Mamiya RAW Image | 3.7 |
| .MEG | MEGA Data File | 4.3 |
| .MEGA | Megacubo XML Metafile | 3.9 |
| .MEGA | MEGAsync Temporary Data File | 4.3 |
| .MEL | Maya Embedded Language Script | 3.7 |
| .MELL | Mellel Word Processing File | 2.8 |
| .MELLEL | Mellel Document | 3.0 |
| .MELSAVE | Melon Playground Saved Game | 3.8 |
| .MEMO | Samsung Memo | 3.4 |
| .MENC | Windows Mobile Encrypted File | 3.9 |
| .MENU | macOS Menu Extra | 4.0 |
| .MENU | Quake 3 Engine Menu File | 4.3 |
| .MEO | MEO Encrypted Archive | 3.8 |
| .MEPS | Movavi Slideshow Maker Project | 3.3 |
| .MEPX | Movavi Video Project | 3.7 |
| .MER | RSView Development Runtime File | 3.4 |
| .MERLIN2 | Merlin Project File | 4.0 |
| .MESH | Godot Engine 3D Mesh File | 4.4 |
| .MET | eMule Resource File | 4.1 |
| .MEX | Macro Express File | 3.0 |
| .MF | Java Manifest File | 3.9 |
| .MF4 | ASAM Measurement Data Format File | 2.8 |
| .MFA | MobileFrame App File | 2.8 |
| .MFIL | Blizzard Software Update File | 3.0 |
| .MFL | ModFit LT Analysis Report File | 2.0 |
| .MFL | Mozilla FastLoad File | 4.5 |
| .MFO | Perl ModInfo Descriptor File | 3.8 |
| .MFO | MediaFace Online Saved File | 3.7 |
| .MFP | Markforged Print | 3.0 |
| .MFP | MediaFACE Project File | 4.1 |
| .MFP | MobileFrame Package | 3.0 |
| .MFT | MediaFACE Project Template | 2.7 |
| .MFU | MobileFrame Update File | 3.0 |
| .MGA | Manga Document | 3.0 |
| .MGCB | Equation Illustrator Project File | 3.0 |
| .MGDATABASE | MacGourmet Deluxe Database File | 3.3 |
| .MGK | ImageMagick Configuration File | 3.4 |
| .MGL | Age of Empires 2 Replay File | 4.0 |
| .MGMF | MindGenius Map File | 2.0 |
| .MGMX | MindGenius XML Map File | 2.9 |
| .MGO | MacGourmet Recipe File | 3.5 |
| .MGOURMET | MacGourmet Deluxe Recipes | 4.0 |
| .MGOURMET4 | MacGourmet Deluxe 4 Recipes | 2.8 |
| .MGT | Musicnotes Guitar Guru Song File | 4.0 |
| .MGV | PSP Video File | 3.7 |
| .MGV | Yamaha MegaVoice File | 2.5 |
| .MGX | Age of Empires 2 Expansion Replay File | 3.3 |
| .MGX | Rise of Nations Saved Game | 4.1 |
| .MHM | Microsoft Hardware Macro | 3.0 |
| .MHS | Xilinx XPS Hardware Specification File | 3.8 |
| .MHTML | MIME HTML File | 3.6 |
| .MI4 | Audio Player Firmware File | 3.3 |
| .MID | MIDI File | 4.0 |
| .MID | MapInfo Data File | 3.0 |
| .MIDI | MIDI Music Data | 4.0 |
| .MIF | MapInfo Interchange Format File | 3.7 |
| .MIF | FrameMaker Interchange Format File | 4.0 |
| .MIFF | Magick Image | 2.5 |
| .MII | Wii Virtual Avatar File | 4.5 |
| .MILK | MilkDrop Winamp Plug-in Preset | 4.1 |
| .MIM | Multi-Purpose Internet Mail Message File | 3.3 |
| .MIME | Multi-Purpose Internet Mail Extension | 3.3 |
| .MINDNODE | MindNode Document | 2.0 |
| .MINESWEEPERSAVE-MS | Minesweeper Saved Game | 2.8 |
| .MINIGSF | Game Boy Advance Song File | 4.0 |
| .MINISO | Mini Image Destination File | 2.2 |
| .MINIUSF | Nintendo 64 Song File | 2.8 |
| .MINT | Linux Mint Installer File | 4.5 |
| .MIO | MioEngine Application File | 2.5 |
| .MIPROJECT | Mine-imator Project | 3.4 |
| .MIS | Saved Game Mission File | 2.5 |
| .MIS | Marble Blast Mission File | 4.3 |
| .MIX | 3ds Max Motion Mixer File | 4.2 |
| .MIX | Microsoft Image Exchange File | 2.8 |
| .MJ2 | Motion JPEG 2000 Video | 3.7 |
| .MJD | Adobe Acrobat MIME Encoded Job Definition File | 3.7 |
| .MJDOC | MacJournal Document | 3.0 |
| .MJK | Question File | 3.4 |
| .MJP | MJPEG Video File | 3.0 |
| .MJS | Node.js ES Module File | 4.0 |
| .MK | Makefile | 3.8 |
| .MK3D | Matroska 3D Video File | 3.3 |
| .MKA | Matroska Audio | 4.0 |
| .MKV | Matroska Video | 4.1 |
| .ML | ML Source Code File | 3.9 |
| .MLB | MyLabel Designer Deluxe Project File | 3.3 |
| .MLC | Microsoft Language Interface Pack | 3.9 |
| .MLK | MasterCook Look File | 3.5 |
| .MLM | MolMeccano File | 3.5 |
| .MLMODEL | Create ML Model | 3.0 |
| .MLPROJ | Create ML Project | 3.0 |
| .MLPROJ | MATLAB Archived Project | 3.3 |
| .MLS | Milestones Simplicity File | 3.9 |
| .MLS | CrystalPlayer Playlist | 4.0 |
| .MM | Objective-C++ Source File | 4.1 |
| .MM | Mind Map File | 3.5 |
| .MM | NeXtMidas Macro File | 3.6 |
| .MMAP | MindManager Map | 3.4 |
| .MMBAK | Money Manager Expense & Budget Backup | 3.5 |
| .MMC | Microsoft Media Catalog | 4.0 |
| .MME | Multi-Purpose Internet Mail | 3.6 |
| .MMF | Meal-Master Recipe File | 2.9 |
| .MMF | Synthetic Music Mobile Application File | 2.8 |
| .MMG | Model Master 3 Axis Flat File | 3.5 |
| .MMIP | MediaMonkey Installation Package | 3.3 |
| .MML | FrameMaker Maker Markup Language File | 3.4 |
| .MML | Mathematical Markup Language File | 4.3 |
| .MMLP | Music Macro Language Project | 4.0 |
| .MMM | Multiple Master Metric Data File | 3.0 |
| .MMM | Music Maker Arrangement File | 3.2 |
| .MMO | Memory Map Overlay File | 3.3 |
| .MMP | Symbian Project Specification File | 2.9 |
| .MMP | MindManager Mind Map | 3.0 |
| .MMP | MixMeister Playlist | 3.3 |
| .MMP | Master Album Maker Project | 3.5 |
| .MMPZ | LMMS Project File | 3.8 |
| .MMRC | MADRIX MIDI Remote Configuration | 3.8 |
| .MMW | AceMoney Money File | 2.7 |
| .MNC | My Notes Center Notebook | 3.5 |
| .MNG | Multiple-Image Network Graphic | 3.9 |
| .MNK | My Notes Keeper Notebook | 3.7 |
| .MNL | AutoCAD Menu LISP File | 3.5 |
| .MNO | Macromedia Design Note | 3.5 |
| .MNR | AutoCAD Menu Resource File | 4.2 |
| .MNS | AutoCAD Interface Settings File | 3.3 |
| .MNU | AutoCAD Interface Layout File | 4.0 |
| .MNV | PlayStation Movie File | 3.6 |
| .MO | Machine Object File | 3.7 |
| .MO3 | MO3 Audio | 3.5 |
| .MOBI | Mobipocket eBook | 3.9 |
| .MOBILECONFIG | Apple Mobile Configuration File | 3.9 |
| .MOBILEPROVISION | Xcode Mobile Provisioning Profile | 4.1 |
| .MOBIRISE | Mobirise Project File | 2.0 |
| .MOD | Music Module File | 3.6 |
| .MOD | Fortran Module | 2.9 |
| .MODE | Coda Syntax Mode File | 3.5 |
| .MODEL | CATIA 3D Model | 3.9 |
| .MODFEM | Femap Model | 4.0 |
| .MODULE | Drupal Module File | 3.8 |
| .MOEF | Apple Motion Effect Project Template | 3.8 |
| .MOF | Managed Object Format File | 3.4 |
| .MOHO | Moho Animation Project | 3.4 |
| .MOI | MOI Video File | 3.4 |
| .MOL | MDL Molfile | 3.3 |
| .MOM | Managed Object Model | 3.1 |
| .MONEY | Money Data File | 2.5 |
| .MONOPIC | Monodraw Picture | 3.0 |
| .MONOSNIPPET | Monodraw Snippet | 3.0 |
| .MONTAGE | Montage Screenplay File | 3.2 |
| .MOS | Leaf Camera RAW Image | 3.6 |
| .MOSAIC | MacOSaiX Mosaic File | 4.0 |
| .MOT | LightWave Motion File | 1.8 |
| .MOTI | Apple Motion Title Project Template | 3.5 |
| .MOTN | Apple Motion Generator Project Template | 3.2 |
| .MOTR | Apple Motion Transition Project Template | 4.3 |
| .MOV | Apple QuickTime Movie | 3.5 |
| .MOVPKG | High-Resolution Lossless Media File | 3.1 |
| .MOX | Montax Imposer Template Document | 2.5 |
| .MOX | ExtendSim Simulation Software Model | 3.4 |
| .MP | Maya PLE Project File | 2.7 |
| .MP | LaTeX MetaPost File | 3.2 |
| .MP11 | Multisim 11 Project File | 3.7 |
| .MP13 | Multisim 13 Project | 3.0 |
| .MP14 | Multisim 14 Project | 2.8 |
| .MP2 | MPEG Layer II Compressed Audio File | 2.8 |
| .MP21 | MPEG-21 Multimedia File | 1.8 |
| .MP21 | AXMEDIS MPEG-21 Object | 3.3 |
| .MP2M | Max Payne 2 Mod | 4.2 |
| .MP2S | Max Payne 2 Saved Game | 4.4 |
| .MP3 | MP3 Audio | 4.1 |
| .MP4 | MPEG-4 Video | 3.9 |
| .MPA | MPEG-2 Audio File | 3.3 |
| .MPC | Musepack Compressed Audio File | 2.8 |
| .MPCPL | Media Player Classic Playlist | 4.1 |
| .MPD | Microsoft Project Database | 3.5 |
| .MPD | MPEG-DASH Media Presentation Description | 4.0 |
| .MPD | Melodyne Project | 3.3 |
| .MPDP | MixPad Project File | 3.5 |
| .MPEG | MPEG Video | 3.8 |
| .MPF | Microsoft Media Package FIle | 3.7 |
| .MPF | MARS Project File | 4.3 |
| .MPG | MPEG Video | 3.5 |
| .MPGA | MPEG-1 Layer 3 Audio File | 3.2 |
| .MPGINDEX | Adobe MPEG Index File | 3.0 |
| .MPH | Photostory Deluxe Project | 2.9 |
| .MPJ | messiahStudio Project File | 2.6 |
| .MPJ | RoboHelp HTML Project | 2.0 |
| .MPK | ArcGIS Map Package | 3.9 |
| .MPKG | macOS Meta-Package | 4.0 |
| .MPKT | MOPEKS Trial File | 3.5 |
| .MPL | AVCHD Playlist File | 3.4 |
| .MPM | Max Payne Mod | 4.3 |
| .MPO | Multi Picture Object File | 3.5 |
| .MPP | Microsoft Project File | 3.5 |
| .MPP | MobileFrame Project Publisher File | 3.4 |
| .MPPZ | MagicPlot Project File | 4.3 |
| .MPQ | Blizzard Mo'PaQ File | 4.1 |
| .MPROJ | Mine-imator Project | 3.6 |
| .MPS | Mathematical Programming System File | 3.5 |
| .MPT | Microsoft Project Template | 3.3 |
| .MPTM | OpenMPT Module | 4.0 |
| .MPV | MPEG-2 Elementary Stream Video | 3.6 |
| .MPWS | MathPiper Worksheet | 3.0 |
| .MPX | FoxPro Compiled Program Menu | 3.8 |
| .MPX | Microsoft Project Exchange File | 3.5 |
| .MPZ | Miradi Project File | 3.3 |
| .MQ5 | MQL5 Source Code File | 4.4 |
| .MQO | Metasequoia Document | 3.8 |
| .MQV | Sony Movie Format | 2.2 |
| .MRC | mIRC Script File | 3.4 |
| .MRG | Now Contact Merge Template | 3.5 |
| .MRIMG | Macrium Reflect Disk Image | 3.6 |
| .MRK | DPOF Auto Print Order File | 3.6 |
| .MRML | 3D Slicer Scene Description File | 3.8 |
| .MRP | Mythroad Platform File | 3.6 |
| .MRS | GunZ Game Data File | 4.1 |
| .MRT | Stimulsoft Report File | 3.7 |
| .MRW | Minolta Raw Image | 3.2 |
| .MRXS | MIRAX Virtual Slide File | 2.1 |
| .MS | 3ds Max Script | 3.0 |
| .MS | Maxwell Script | 3.5 |
| .MS-ONE-STUB | Microsoft OneNote Stub | 2.0 |
| .MS10 | Multisim 10 Circuit Design File | 4.5 |
| .MS11 | Multisim 11 Circuit Design File | 3.1 |
| .MS13 | Multisim 13 Circuit Design File | 3.9 |
| .MS14 | Multisim 14 Circuit Design File | 4.2 |
| .MS3D | MilkShape 3D Model | 3.7 |
| .MSB | Oracle Binary Message File | 4.2 |
| .MSC | Microsoft Management Console Snap-in Control File | 4.0 |
| .MSCT | MOPEKS Script File | 3.0 |
| .MSCZ | MuseScore Compressed Score File | 3.9 |
| .MSD | Map Service Definition File | 3.7 |
| .MSDVD | Windows DVD Maker Project File | 4.0 |
| .MSE | MediaShow Slideshow Project File | 3.9 |
| .MSE | 3ds Max Encrypted MAXScript File | 3.5 |
| .MSF | Mail Summary File | 4.1 |
| .MSG | Outlook Message Item File | 3.4 |
| .MSHA | Microsoft Help Asset File | 3.3 |
| .MSHC | Microsoft Help Container File | 3.3 |
| .MSHI | Microsoft Help Index File | 3.3 |
| .MSI | Windows Installer Package | 3.7 |
| .MSIM | mSecure Password Manager Backup File | 1.8 |
| .MSIX | MSIX Installer Package | 3.7 |
| .MSIXBUNDLE | Windows 10 App Bundle | 3.8 |
| .MSIXUPLOAD | Windows 10 App Upload Bundle | 3.3 |
| .MSKN | MediaMonkey Skin File | 3.0 |
| .MSL | Mapping Specification Language File | 2.0 |
| .MSL | Magick Scripting Language File | 3.5 |
| .MSM | Windows Installer Merge Module | 3.8 |
| .MSMPL_BANK | Korg microSAMPLER Bank Data File | 3.0 |
| .MSN | Host Blocking File | 4.0 |
| .MSO | Outlook In-Line Office Attachment | 2.7 |
| .MSO | Microsoft Office Macro Reference File | 3.3 |
| .MSP | Windows Installer Patch | 3.6 |
| .MSP | Microsoft Paint Bitmap Image | 3.7 |
| .MSP | MaxScript Page File | 2.4 |
| .MSPROJ | Message Studio Project | 3.0 |
| .MSPX | Microsoft ASP.NET Web Page | 2.9 |
| .MSS | Microprocessor Software Specification File | 3.3 |
| .MSS | CartoCSS Map Stylesheet | 2.5 |
| .MSSTYLES | Windows XP Style | 3.9 |
| .MST | Windows Installer Setup Transform File | 4.1 |
| .MSTXT | Message Studio Text File | 3.7 |
| .MSU | Windows Vista Update Package | 4.2 |
| .MSWMM | Windows Movie Maker Project | 3.9 |
| .MTA | Samsung AllShare Metadata File | 3.1 |
| .MTC | Make the Cut! Project | 3.0 |
| .MTD | Musicnotes Digital Sheet Music File | 4.2 |
| .MTF | Multi Tracker File | 3.6 |
| .MTF | Motorola Theme File | 3.3 |
| .MTFF | MadgeTech Data Logger Report | 3.4 |
| .MTHD | MOPEKS Method File | 4.0 |
| .MTL | OBJ Material Template Library File | 3.5 |
| .MTM | MultiTracker Module | 4.3 |
| .MTP | MadTracker 2 Pattern | 3.6 |
| .MTS | AVCHD Video | 3.5 |
| .MTS | MadTracker 2 Sample File | 2.7 |
| .MTS | MEGA Tree Session File | 3.3 |
| .MTV | MTV Video Format File | 3.2 |
| .MTW | Minitab Worksheet File | 2.6 |
| .MTXT | MOPEKS Text File | 3.0 |
| .MTZ | MIUI Theme | 3.8 |
| .MTZU | MTZU Ransomware Encrypted File | 2.8 |
| .MUD | Mudbox 3D Scene File | 3.5 |
| .MUI | Multilingual User Interface File | 4.0 |
| .MUL | Ultima Online Multi File | 3.0 |
| .MUM | Windows Vista Update Package | 3.4 |
| .MUM | MATLAB Unit Operation Model File | 2.4 |
| .MUN | Windows System Resource Archive | 2.0 |
| .MUP | Music Publisher Score | 2.5 |
| .MUS | Minecraft Music File | 3.6 |
| .MUS | Finale Notation File (Legacy) | 3.6 |
| .MUSE | Adobe Muse Website Project | 3.0 |
| .MUSICLIBRARY | Apple Music Library | 4.0 |
| .MUSICXML | MusicXML File | 3.3 |
| .MUSX | Finale Notation File | 3.2 |
| .MUX | Trackmania Music File | 3.6 |
| .MV | MivaScript File | 3.2 |
| .MVC | MivaScript Compiled File | 2.9 |
| .MVD | MindView OS X Document | 2.5 |
| .MVDX | MindView Windows Document | 3.7 |
| .MVG | Magick Vector Graphics File | 3.5 |
| .MVI | AutoCAD Movie Command File | 3.8 |
| .MVP | MoviePlus Project File | 3.4 |
| .MVP | MAGIX Video Project | 3.6 |
| .MVY | Video easy Project File | 2.0 |
| .MW | Maple Worksheet | 2.7 |
| .MWB | MySQL Workbench Document | 3.5 |
| .MWD | Mariner Write Document | 3.0 |
| .MWF | MapGuide Author Map Window File | 3.7 |
| .MWF | Translation Memory Word Find File | 2.5 |
| .MWL | Super Mario World Level | 3.8 |
| .MWP | Lotus Word Pro SmartMaster File | 3.0 |
| .MWS | Maple Classic Worksheet | 2.6 |
| .MWX | MapGuide Author Map Window XML File | 3.3 |
| .MX | Mathematica Serialized Package File | 3.3 |
| .MX5 | Mixcraft 5 Audio Project | 3.2 |
| .MX8 | Mixcraft 8 Project | 3.0 |
| .MX9 | Mixcraft 9 Project | 3.3 |
| .MXAD | Mandelbrot Explorer All Data File | 4.0 |
| .MXADDON | Maxthon Add-On File | 3.6 |
| .MXD | ArcGIS Map Document | 3.5 |
| .MXE | Macro Express Playable Macro | 3.3 |
| .MXF | Material Exchange Format | 3.7 |
| .MXI | Maxwell Image | 2.5 |
| .MXI | Adobe Extension Information File | 3.5 |
| .MXL | Compressed MusicXML File | 3.8 |
| .MXM | Maxwell Material File | 3.8 |
| .MXMF | Mobile XMF Ringtone File | 3.4 |
| .MXML | Flex MXML Component | 3.8 |
| .MXP | Adobe Extension Package | 3.4 |
| .MXS | Maxwell Studio Scene File | 4.0 |
| .MXSKIN | Maxthon Skin File | 2.7 |
| .MXT | ArcGIS Map Template | 4.0 |
| .MYAPP | Visual Studio Application XML File | 3.4 |
| .MYCOLORS | Stardock MyColors Theme File | 4.1 |
| .MYD | MySQL Database Data File | 3.3 |
| .MYDOCS | Send To My Documents | 3.2 |
| .MYI | MySQL MyISAM Index File | 3.3 |
| .MYL | MyLogo Maker Image | 3.0 |
| .MYNOTESBACKUP | Keep My Notes Backup | 2.5 |
| .MYO | AccountEdge Company File | 3.1 |
| .MYR | Myriad Music File | 3.2 |
| .MZP | MAXScript Zip Package | 3.4 |
| .MZP | WinArchiver Mountable Archive | 3.0 |
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