List of Data File Formats Starting with the Letter "M"
| .m | Function (program) (Matlab) |
| Macro module (Brief) | |
| Standard package (Mathematica) | |
| .m11 | Text file (MASS11) |
| .m1v | MPEG-1 Video file |
| .m2p | MPEG-2 Program Stream Format file |
| .m2ts | BDAV MPEG-2 file |
| .m2v | MPEG-2 Video Only file |
| .m3 | Modula 3 source code file |
| .m3d | 3D animation macro |
| .m3u | Music Playlist (Winamp) |
| .m4 | M4 preprocessor file (unix) |
| .m4a | MPEG-4 Audio Layer |
| .m4b | MPEG-4 Audio Book file |
| .m4p | MPEG-4 Encoded Audio file |
| .m4r | iPhone Ringtone file |
| .m4v | Apple Video file |
| .m_u | Backup of boot sector, FAT and boot dir (MazeGold) |
| .ma3 | Macro (Harvard Graphics 3.0) |
| .mac | Bitmap graphics (Macintosh MacPaint) |
| Macro | |
| .mad | MS Access Module Shortcut |
| .maff | Mozilla Archive Format file |
| .mag | Woody Lynn's MAG graphics format (MPS Magro Paint System) |
| .mai | Mail (VAX) |
| .mak | Makefile |
| Project file (Visual Basic) | |
| .man | Command manual |
| .map | Color palette |
| Format data (Micrografx Picture Publisher) | |
| Linker map file | |
| Map (Atlas MapMaker) | |
| Network map (AccView) | |
| .mar | Mozilla Archive |
| Microsoft Access Report file | |
| Assembly program (VAX Macro) | |
| .mas | Smartmaster set (Freelance Graphics) |
| .mat | Data file (Matlab) |
| Microsoft Access Shortcut file | |
| .max | Max source code file |
| Microsoft Data Analyser View | |
| .mb | Memo field values for database (Paradox) |
| .mbf | MS Money Backup file |
| .mbk | Multiple index file backup (dBASE IV) |
| Medisoft for Windows Backup | |
| .mbx | Mailbox (Eudora/Zerberus) |
| .mcc | Configuration file (Mathcad) |
| .mcd | Document (Mathcad) |
| .mcf | Mathcad font |
| Meta Content Format file | |
| Master Command file | |
| TMPGEnc template | |
| .mci | Mci command script (Media Control Interface) |
| .mcp | Application script (Capsule) |
| Printer driver (Mathcad) | |
| .mcr | DataCAD Keyboard macro file |
| .mcw | Text file (MacWrite II) |
| .mcx | Graphic file |
| .md | Compressed file archive created by MDCD (mdcd10.arc) |
| .md5 | MD5 Checksum file |
| Message Digest 5 (Easy MD5 Creator) | |
| .mda | Data (MS Access) |
| .mdb | Database (MS Access) |
| .mde | Microsoft Access MDE database |
| .mdf | Accelio Capture Classic (JetForm) Filler |
| I-deas Master Drafting Machine Data file | |
| Menu Definition file | |
| MS-SQL Master Database file | |
| Alcohol 120% CD Image File | |
| .mdi | Microsoft Office 2003 imaging format |
| Borland multiple document interface | |
| .mdk | Keyboard Map file |
| .mdl | Model (3D Design Plus) |
| Spreadsheet (CA-Compete!) | |
| .mdm | Modem definition (TELIX) |
| .mdmp | Microsoft Windows XP Trouble Report |
| .mdr | FaxTalk Modem Doctor Modem Report file |
| .mdt | Data table (MS ILink incremental linker) |
| .mdx | Multiple index file (dBASE IV) |
| .mdz | MS Access Wizard Template |
| .me | Usually ASCII text file READ.ME |
| .meb | Macro Editor bottom overflow file (WordPerfect Library) |
| .med | Macro Editor delete save (WordPerfect Library) |
| Music (OctaMED) | |
| .mem | Macro Editor macro (WordPerfect Library) |
| Memory variable save file (Clipper - dBASE IV - FoxPro) | |
| .meq | Macro Editor print queue file (WordPerfect Library) |
| .mer | Macro Editor resident area (WordPerfect Library) (vakioalue) |
| .mes | Macro Editor work space file (WordPerfect Library) |
| Message | |
| .met | Document (Omnipage Pro) |
| eDonkey2000 file | |
| Macro Editor top overflow file (WordPerfect Library) | |
| Presentation Manager Meta file | |
| .meu | Menu group (DOS Shell) |
| .mex | Mex file (executable command) (Matlab) |
| Macro Editor expound file (WordPerfect Library) | |
| Mioplanet mex reader interactive file | |
| .mf | Metafont text file |
| .mfx | ImageMAKER Fax Viewer folder file |
| .mgf | Font (Micrografx) |
| .mgi | Modular Gateway Interface |
| .mgp | MagicPoint Presentation file |
| .mhp | MS Home Publishing Project |
| .mht | MS MHTML Document |
| .mia | MusicIndiaOnline player music file |
| .mib | Snmp MIB file |
| .mic | Microsoft Image Composer file |
| .mid | Standard MIDI file (music synthetizers) |
| .mif | Maker Interchange Format (FrameMaker) |
| .mii | Datafile (MicroStat-II) |
| .mim | MIME file |
| .mio | Multimedia Interactive Object |
| .mip | Paint Shop Pro Multiple Image Print file |
| .mis | Delta Force Land Warrior Mission |
| MagicInstall Installation Script | |
| Tribes 2 Game file | |
| .mix | Object file (Power C) |
| .mk | Makefile |
| .mkd | Pervasive Btrieve files |
| .mke | Makefile (MS Windows SDK) |
| .mki | Japanese graphics MAKIchan format (MagView 0.5) |
| .mks | Data (TACT) |
| .ml3 | Project (Milestones 3.x) |
| .mlb | Macro library file (Symphony) |
| .mlm | Novel Groupwise e-mail file |
| .mm | Text file (MultiMate Advantage II) |
| .mmc | Media Catalog |
| MSoffice Media Content | |
| .mmd | Peristudio/PeriProducer file |
| .mmf | Mail message file (MS Mail) |
| .mml | Mail Meta Language |
| .mmm | Movie (RIFF RMMP format) (MacroMind Director 3.x) |
| .mmo | Memo writer file (RapidFile) |
| .mmp | Output video format from Bravado board |
| .mmx | Command & Conquer Red Alert 2 Map file |
| Oracle Forms Compiled Menu | |
| .mmz | MusicMatch Theme file |
| .mnd | Menu source (AutoCAD Menu Compiler) |
| .mng | Map (DeLorme Map'n'Go) |
| .mnt | Menu memo (FoxPro) |
| .mnu | Advanced macro (HP NewWave) |
| Menu (AutoCAD Menu Compiler - Norton Commander - Signature) | |
| .mnx | Compiled menu (AutoCAD) |
| Menu (FoxPro) | |
| .mny | Account book (MS Money) |
| .mob | Device definition (PEN Windows) |
| .mod | Modula-2 source code file (Clarion Modula-2) |
| Windows kernel module | |
| Music (FastTracker - many) | |
| .mol | MDL Molfile |
| .mon | Monitor description (ReadMail) |
| .mov | QuickTime Video Clip |
| Apple QuickTime Audio | |
| AutoCAD AutoFlix Movie | |
| .mp2 | Mpeg audio file (xing) |
| .mp3 | mp3PRO Audio file |
| MPEG Audio Stream, Layer III | |
| SHARP MZ-series Emulator file | |
| Wrapster Wrapped file | |
| .mp4 | MPEG-4 Video File |
| .mpa | MPEG Audio Stream, Layer I, II or III |
| .mpc | Calender file (MS Project) |
| .mpd | MS Project database file |
| .mpe | MPEG Movie Clip |
| .mpeg | MPEG Movie Clip |
| .mpf | MS Design Gallery |
| MosASCII Project Workspace file | |
| .mpg | MPEG-1 animation |
| .mpl | Playlist Data file |
| .mpls | Blu-ray Information file |
| .mpm | Mathplan macro (WordPerfect Library) |
| .mpp | Project file (MS Project) |
| CAD Drawing File | |
| .mpq | Blizzard Game Data file |
| .mpr | Generated program (FoxPro) |
| .mps | Multimedia File |
| Casio PDL Pocket Streets Map | |
| .mpt | Bitmap graphics (Multipage TIFF) |
| Template File (MS Project) | |
| .mpv | View file (MS Project) |
| .mpw | MosASCII Project Workspace file |
| .mpx | Compiled menu program (FoxPro) |
| .mrb | Multiple Resolution Bitmap graphics (MS C/C++) |
| .mrc | MIRC Script file |
| Bibliographic Data Format | |
| .mrk | Informative Graphics markup file |
| .mrs | Macro Resource file (WordPerfect for Win) |
| .msc | MS C makefile |
| .msd | MS Diagnostic Utility Report |
| .msf | Multiple Sequence file |
| .msg | Message |
| .msi | Windows Installer file |
| .msm | MultiSIM Circuit Diagram |
| .msn | MSN Content Plus file |
| .mso | Math Script Object file |
| MS FrontPage file | |
| MS Word OLE Web Page Storage Stream | |
| .msp | Bitmap graphics (Microsoft Paint) |
| .mspx | XML based Web Page |
| .mss | Manuscript text file (Perfect Writer - Scribble - MINCE - Jove) |
| .mst | ChemFinder Chemical Structure Index |
| DATAIR Pension System Master file | |
| Minispecification file (Prosa) | |
| Setup script (MS Windows SDK) | |
| Visual Test Source file | |
| .msu | Windows Update file |
| .msv | Sony Memory Stick Format |
| .msw | Text file (MS Word) |
| .mswmm | Windows Movie Maker Project |
| .msx | Compressed CP/M file archive created by MSX |
| .mtd | Digital Sheet Music |
| .mth | Math file (Derive) |
| .mtm | Multitracker Module music |
| .mts | AVCHD Video file |
| Viewpoint iPix file | |
| .mtv | MTV Music Generator |
| .mtw | Datafile (Minitab) |
| .mtx | Temporary File often used by a browser or TWAIN device |
| Viewpoint iPix file | |
| Max Magic Microtuner tuning text file | |
| .mu | Menu (Quattro Pro) |
| .mu3 | Myriad Music file (packed sounds & digital tracks) |
| .muf | ProtoMuck Multi User Forth Program |
| .mul | Ultima Online Game |
| .mus | MusicTime Sound file |
| Myriad Music file | |
| .mvb | Database |
| MS Multimedia viewer file | |
| MvPCbase www.mvsoft-comp.com | |
| .mvc | Music Collector Collection Manager file |
| .mvd | MicroDVD (DVD movie file) |
| .mvf | Stop frame file (AutoCAD AutoFlix) |
| .mvi | Movie command file (AutoCAD AutoFlix) |
| .mvw | Log file (Saber LAN) |
| .mwf | Animation (ProMotion) |
| .mwp | Lotus Wordpro 97 Smartmaster file |
| MegaWorks Pack file | |
| .mws | Maple Worksheet File |
| .mwv | MovieWorks file |
| .mxd | GIS Project file |
| .mxe | Macro Express |
| Mindex Effect Album | |
| .mxf | Material eXchange Format for the interchange of audio-visual |
| Material with associated data and metadata. | |
| .mxl | Moxcel Spreadsheet File |
| .mxm | MS Project/Outlook Team Assign Task |
| .mxp | Macromedia Extension Manager |
| ArcReader Published Map | |
| .mxt | Data (MS C) |
| .myp | Presentation (MM Make Your Point) |
| .myr | Myriad Music file |
| .mys | Myst Saved Game |
| .myt | Myriad Tutorial file |
| .mzp | Maxscript Compressed File |
