File Extensions beginning with the letter 'M'

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Extension currently sorted on Extension Description click to sort by Description Format MIME Type
M (2) MatLab
M (1) Mathematica
M11 Document; MASS11
M1V MPEG-related file (MIME type 'mpeg')
M1V MPEG Movie; video/mpeg; see MOV (MIME: video/mpeg)
M2V MPEG 2 Movie; see MPG
M3 Modula 3 programming language source code
M3D Picture; Corel Motion 3D
M3D Corel Motion 3D animation
M3G Mobile 3D Graphics for J2ME (JSR-184)
M3U MPEG URL (MIME audio file)
M4 UNIX preprocessor
MA3 Harvard Graphics
MAB Mozilla Address Book. Email addresses and lists for Mozilla and Thunderbird.
MAC Microsoft Access Command
MAC MacPaint bitmap image. Details
mac macro
MAC Macro for Borland TASM
MAD Microsoft Access Database Module
MAD Microsoft Access module
MAF Microsoft Access Form
MAFF Mozilla Archive File Format. A web page with all related files saved into a single file. Details. [MAFF]
MAG (2) Magenta color separation; BLA (Black) CYA (Cyan), YEL (Yellow) Adobe Color Separation
MAG A graphics file format found in some Japanese files
MAG (1) Bitmap Picture; MPS Magro Paint
MAGIC Magic Mail Monitor configuration file
MAI Microsoft Mail message
MAK Visual Basic or MS Visual C++ Project
MAK Make; Program compiler make file; see DSW
mak makefile
MAM Database Program; Microsoft Access Database Macro
MAM Microsoft Access Macro
MAN (1) (MIME: application/x-troff-man)
MAN Unix Manual page output
MAN (2) Text (manual)
manifest Microsoft Clickonce applicaton manifest [ms-clickonce] application/x-ms-manifest
map program symbol map
MAP Duke Nukem 3D WAD game file
MAP (4) Game Level for Duke3D, Doom
MAP (3) Programming Linker segment map
MAP (1) Geography Map
MAP (5) Inprise (Borland) Delphi Games Creator Map Library; CRL, IML, SDL
MAP Map file
MAP (2) MAPI Mail
MAQ Microsoft Access Query
MAQ Database Query; Microsoft Access Database Query
MAR Microsoft Access Report
MAR Meta-ARchive. More info
MAR Source Code; VAX Assembly Language; see ASM
MAS Lotus Freelance Graphics Smartmaster file
MAS Lotus Freelance Graphics Smart Master look; see SMC
MAT Matlab variables binary file
MAT Microsoft Access Table
MAT (1) Microsoft Access Database Table Shortcut
MAT (2) MatLab
MAUD MAUD sample format
MAX Visioneer PaperPort scanned Document, compressed Picture
MAX OrCAD layout file
MAX Paperport file
MAX KINETIX's 3D Studio MAX file format for a 3D scene
MAZ Hover maze data
MAZ A file format use by Division's dVS/dVISE
MAZ Windows' Hover maze
MB Database Text; Paradox Memo
MB1 Apogee Monster Bash
MB1 Apogee Monster Bash data file
MBF Corel Visual DTD Document Type Definition for SGML
MBG Microsoft Mail mailbag
MBK (2) Atari ST, One STOS Memory Bank
MBK (1) Backup; dBase IV Database Index
MBOX Berkeley Unix mailbox format
MBS (1) Micrografx Picture Publisher Brush Shape
MBS (2) Atari ST STOS Memory Banks; see MBK
MBV Corel.visualDTD.7
MBX Extension Microsoft Outlook adds to saved email, Eudora mailboxes
MBX (2) Database Index; dBase index
MBX (1) Document; Outlook Express Mailbox
MC Localized Message Table Resource (Windows)
MCC (3) MathCad configuration; see INI
MCC Dialer10 calling card
MCC (2) Dialer 10 Calling Card
MCC (1) Microsoft Network Shortcut
MCD MathCad
MCF Font; MathCad
MCI MCI command set
MCI Driver; Media Control Interface
MCP metrowerks CodeWarrior project file
MCR DataCAD Keyboard macro file
MCW Microsoft Word for Macintosh document
MCW Apple Macintosh MacWrite
MD (1) Archive; MDCD
MD (2) Picture; MacDraw
MDA Microsoft Access Database Add-in
mda Microsoft Access security database
MDA Microsoft Access workgroup for version 2
MDA Microsoft Access add-in
MDB Access 2.0 Database
mdb Microsoft Access database
MDB Microsoft Access
mdb MS Access Database File
MDB (2) Microsoft file Viewer
MDB Microsoft Access database
MDB (1) Microsoft Database Application
MDB File viewer extension
MDE Microsoft Access MDE file
MDF Menu Definition File
MDL (3) Sound DigiTrakker
MDL (1) 3D Design Plus
MDL Quake model file
MDL Digital Tracker music module (MOD) file
MDL (2) Spreadsheet; CA-Compete
MDM Configuration; Telix modem description
MDN Microsoft Access Blank Database Template
MDN Microsoft Access blank database template
MDP Project Workspace (to do with Microsoft Visual C++ MAK files and Microsoft Visual J++); see DSW, MAK
MDR Database; Medical Drug Reference; see SRL
MDT Microsoft Access Add-in Data
MDW Microsoft Access Workgroup Information
MDW Microsoft Access Workgroup
mdw Microsoft Access security database
MDX (1) dBase index
MDX (2) Microsoft Database Index
MDX (3) Inprise (Borland) Database Index
MDZ Microsoft Access wizard template
MDZ Microsoft Access Wizard Template
ME Text file
MED Sound; Amiga; Med/OctaMed
MED Music Editor, OctaMED music module (MOD) file
MEN Picture; TIF
MER Format for interchanging spreadsheet/database data; recognized by Filemaker, Excel, and others
MET OS/2 Presentation Manager Metafile. Vector and raster image. Details
MEX MatLab
MF (1) FrameMaker MakerFile
MF (2) Font; MetaFont
MFF Cakewalk MAPI file
MFG Pro/ENGINEER manufacturing file
MFJ MetaFont batch file
MGF Materials and Geometry Format
MGF A file in a Materials and Geometry Format
MGF (1) Font; Micrografx
MGF (2) Materials and Geometry 3D rendering
MGX Micrografx Clipart Picture
MHK Archive; Mohawk Archive for the game Riven
MHTML MIME HTML. A HTML page with associated file grouped together. See RFC 2257. [MIME-HTML]
MI ME10/30
MI Miscellaneous
MIC Microsoft Image Composer file
MIC Microsoft Image Composer
Microsoft Office Binder
MID (1) Sound; MIDI Sequence; see MOD (MIME: audio/mid)
MID MIDI sequence
mid MIDI file (music)
MID (2) Eudora Script
mid MIDI Sound File
MID MIDI music
MIDI Same as MID
midi MIDI file (music)
MIF Adobe FrameMaker Interchange Format
MIF (3) Watcom Make script
MIF MIDI instrument file
MIFF Magick Image File Format. Raster image. Native format for ImageMagick. Details
MII Data; MicroStat-II
MII Database; MicroStat-II
MIM Mime encoded; see MME
MIM A multipart file in the Multi-Purpose Internet Mail Extensions (MIME) format; often created as the result of sending e-mail with attachments in AOL. The files in a multipart MIM file can be "opened" (unarchived and separated into individual files) using W
MIX Microsoft Image Exchange. Raster image (usually a photo) vector overlays. [mix]
MIX Object file; Power C; OBJ
MIX Sound; Dance/RaveEjay
MKI (1) Picture; MediaKnife (another Internet Animation Picture)
MKI (2) Picture; MagView; Japanese MAKIchan
MKV Matroska audio/video container. More Info.
ML3 Project; Milestones 3
MLB (1) FoxPro for Macintosh Library
MLB (2) Lotus Symphony macro
MLI Encarta Media List
MLI A file in 3D Studio's Material-Library format
MLP Bitmap Picture; Mac Link Plus Capture
MM MealMaster receipe file.
MM Document; MultiMate Advantage
MME A multipart file in the Multi-Purpose Internet Mail Extensions (MIME) format; often created as the result of sending e-mail with attachments in AOL. The files in a multipart MME file can be "opened" (unarchived and separated into individual files) using W
MME Mime encoded; see MIM
MMF Microsoft Mail Message (like an INI or the Registry)
MMF Meal Master Format, a recipe catologing format
MMF Microsoft Mail File
MMF Microsoft Mail message file
MMG Beyond 20/20 table or aggregate data file
MMH Microsoft Media Manager Helper DLL (uncommon type)
MML FrameMaker
MMM (2) Movie Clip; RIFF Multimedia movie (Animation)
MMM Microsoft Multimedia Movie
MMM (1) Font; Adobe Type Manager multiple-master metrics; see PFB, PSS
MMM Animation
MMO Document; Ashton Tate RapidFile memo
MMP (1) Movie Clip; Multimedia Player
MMP Mindmapor MindManager file
MMP (2) Microsoft Music Producer
MMW Multimedia World magazine
MN2 Descent2 Mission File
MNB MuPAD Pro Notebook. Details, More
MND, MNI Mandelbrot for Windows
MNF MSN Search
MNF Saved MSN Search
MNG (2) Geography Map; DeLorme Map-N-Go
MNG (1) Picture; Multiple Network Graphics
MNG Multi-image Network Graphics
MNG (3) Bitmap Picture; Animation Shop
MNG Multiple Network Graphics
MNT FoxPro Menu Memo
MNT Microsoft FoxPro menus
MNU (3) Lotus WordPro Menu
MNU (1) AutoCAD Menu
MNU (2) FoxPro Menu
mnu menu
MNU Visual dBASE menu file
MNU Intertel Systems Interact menu file
MNX (2) FoxPro Menu definition
MNX (1) AutoCAD Compiled Menu
MNX Microsoft FoxPro menus
MNY Data; Microsoft Money account
MOC Internet Program; MOCHA Java script; see JS
MOD (3) Digital music sound clip; see MID, IT, XM
MOD (1) Modula-2 programming language source code
MOD (4) Eudora Script
MOD (2) Module
MOD Amiga/PC tracker module
MOD (5) Spreadsheet; Microsoft Multiplan
MOD (6) Windows link Library DLL (rare)
MOD Microsoft Multiplan spreadsheet
mod Modulated Sound File
MOD FastTracker, StarTrekker, Noise Tracker (etc.) music module file
MOD Multiplan v 3, 4.0, 4.1 File
MOO Movie Clip; Apple QuickTime; same as MOV
MOOV Same as MOV
MOV (1) Movie Clip; MOV/MOVIE Apple QuickTime (MIME: video/quicktime)
MOV QuickTime for Windows movie
mov QuickTime movie
mov Quick-Time Movie
MOV (2) AutoCAD AutoFlix
MOVIE Same as MOV (MIME: video/x-sgi-movie)
MOX Packed file (Netscape)
moz Netscape temp save
MP Spreadsheet; Microsoft Multiplan
MP2 MPEG Audio Layer 2
MP3 MPEG Audio Layer 3 (AC3)
mp3 Motion Picture Experts Group
MPA MPEG-related file (MIME type 'mpeg')
MPA MPEG Movie (MIME: video/mpeg)
MPC Microsoft Project calendar
MPD Mini-port driver
MPD (1) Device Driver; Windows Mini-port driver
MPD (2) Microsoft Project for Windows
MPEG Motion Picture Experts Group. Video. Details
MPF Media Package File. Clipart metadata used by more recent versions of Microsoft Office
MPG Short version of MPEG. Video. Details
MPM (1) MPEG Movie
MPM (2) WordPerfect Math Plan macro
MPO Microsoft Org Chart, organizational chart; see OPX
MPP Microsoft Project file
MPP CAD drawing file format
MPR Microsoft FoxPro menus (compiled)
MPR (1) Lotus Approach Smart Master Database application
MPT (1) Bitmap Picture; see TIF
MPT (2) Microsoft Project Data
MPV (1) Movie Clip; MPEG
MPV (2) Microsoft Project view
MPW Microsoft Project for Windows
MPX FoxPro compiled menu; Microsoft Project for Windows
MRB Multiple resolution Bitmap Picture; contains several BMP at different resolutions created by Microsoft MRBC.EXE for help files
MRF Macintosh Font; Font (Vector Drawing?)
MRK Picture; Informative Graphics Markup
MRW Minolta RAW. Raster image from a Minolta digital camera. [RAW]
MSA Magic Shadow Archive
MSA Atari ST Disk Image; Magic Shadow Archive
MSDL Manchesters Scene Description Language
MSDL Manchester Scene Description Language
MSG Exchange Mail Message
MSG Microsoft Exchange mail document
MSG (3) Text Document
MSG (1) Document; Microsoft Exchange mail Document
MSG (2) FoxDoc message (FoxPro)
msg email messages
msg CompuServe email message
MSG Microsoft Mail message
MSI Windows Installer package
MSK Autodesk Animator Mask Format
MSN Microsoft Network home base (Document?); MSN Central
MSN MSN (Microsoft Network)
MSN Descent Mission File
MSN Microsoft Network document
MSN Microsoft Network home base
MSP Windows Installer patch file
MSP Microsoft Paint. Raster image. Details
MSS Shortcut to MSN
MSS Document; manuscript; files created by programs based on Windows SDK Scribble sample application
MST Graphics
MST Windows Installer transform
MST (2) Microsoft Test script
MST (3) Prosa
MST (1) Corel Presentation Master (Presentation Document)
MSW Document; Microsoft Word; see DOC
MSX CP/M Archive
MTF Klik 'n Play Game; GAM
MTH Data; Derive
MTL Wavefront
MTM MultiTracker music module (MOD) file
MTM Sound; MultiTracker Module
MTR Sound; MultiTracker Module Master
MTV Video Clip; see MPG
MTW Database; MiniTab
MU Menu; Inprise (Borland) /Corel Quatro Pro
MU MuPAD Source File. Details, More
MUL Online game called Ultima online
MUR Picture; Atari ST
MUS Music
MUS Sound; Music Time, Doom, Heretic
MUS10 Mus10 audio
MUZ MIDI (used by Windows' Hover game)
MVA Archive; Used by MS, some setup programs
MVB Graphics file
MVB Microsoft Media Viewer Document; display with MVIEWER.EXE or MVIEWER2.EXE.
MVB Microsoft Multimedia Viewer file
mvb Microsoft Media Viewer Book
MVF AutoCAD AutoFlix
MVI AutoCAD AutoFlix
MVW Saber LAN log
MW Document; Apple Macintosh MacWrite
MWP Lotus WordPro Document smart master
MWP Lotus Wordpro 97 Smartmaster file
MX2 MasterCook v5+ receipe file
MXE Corel Quatro Pro startup macro (executed when a Spreadsheet is opened)
MXF Media Exchange Format: used for exchanging multimedia data (including metadata) in professional broadcasting
MXP MasterCook v4 receipe file
MXT Microsoft Programmer's WorkBench Add-In
MYP Presentation; Make-Your-Point
MZT Mozilla Template. HTML template for editing files with NVU