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    IT Management 7 min read

    Letter M: Data Formats & File Extensions

    Find data file formats and file extensions that start with the letter M, or view thousands of formats in the complete list.

    With literally thousands of data file formats employed by Windows and Window-based apps, keeping track of all the file extensions employed by your software applications and programs can be quite a challenge. Fortunately, Webopedia’s Complete List of Data File Formats and File Extensions makes it quick and easy to sift through thousands of file extensions and data file formats to find exactly what you need. You can peruse the full list or search for data formats and file extensions based on the letter they start with from the table below.

    Data File Formats that Begin 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)
    .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)
    .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
    .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

    Recommended Reading: An Introduction to Data File Formats and Their File Extensions

    This article was originally published on June 24, 2010