Browse alphabetically: M

File extension File description Developer/Producer
.m
Objective-C Implementation File Apple
.m12
Schiller medilog ECG Raw Data File Schiller
.m15
MPEG Video Moving Picture Experts Group
.m1a
MPEG-1 Audio File N/A
.m1pg
iFinish Video Clip Media 100
.m1v
MPEG-1 Video File N/A
.m2
World or Warcraft Model Object Blizzard Entertainment
.m21
MPEG-21 File N/A
.m2a
MPEG-1 Layer 2 Audio File N/A
.m2p
MPEG-2 Program Stream File Moving Picture Experts Group
.m2s
Maxthon 2 Browser Skin File Maxthon
.m2t
HDV Video File N/A
.m2ts
Blu-ray BDAV Video File Sony
.m2v
MPEG-2 Video N/A
.m3
Blizzard MDX3 Model File Blizzard Entertainment
.m3d
3D Model File N/A
.m3g
Mobile 3D Graphics Program Nokia
.m3u
Media Playlist File Nullsoft
.m3u8
UTF-8 M3U Playlist File N/A
.m4
Macro Processor Library N/A
.m4a
MPEG-4 Audio File Apple
.m4b
MPEG-4 Audio Book File Apple
.m4e
MPEG-4 Video File N/A
.m4p
iTunes Music Store Audio File Apple
.m4r
iPhone Ringtone File Apple
.m4u
MPEG-4 Playlist N/A
.m4v
iTunes Video File Apple
.m75
MPEG Video Moving Picture Experts Group
.ma
Maya Project File Autodesk
.ma1
Monarch Audio File Monarch
.mab
Mozilla Address Book Mozilla
.mac
MacPaint Image Apple
.macbin
Macbinary Encoded File Apple
.mad
Access Module Shortcut Microsoft
.mae
My Avatar Editor Character File My Avatar Editor
.maf
Mutation Annotation Format File National Cancer Institute
.maff
Mozilla Archive Format File Mozilla
.mag
Access Diagram Shortcut File Microsoft
.magik
Magik Source Code File GE
.mahjongtitanssave-ms
Mahjong Titans Saved Game Microsoft
.mai
Microsoft Mail File Microsoft
.mailhost
MSN Mailhost Settings File Microsoft
.mailplanelicense
Mailplane License File uncomplex
.mailtoloc
Mail Internet Location File Apple
.mak
Makefile N/A
.make
Xcode Makefile Script Apple
.makefile
Makefile N/A
.mako
Mako Template Mako
.mal
MadAppLauncher Configuration File MadAppLauncher
.mam
Microsoft Access Macro Microsoft
.man
Unix Manual N/A
.mani
Mine-imator Project File Mine-imator
.manifest
Windows Application Manifest File Microsoft
.manm
Vietcong Game Data File Pterodon
.map
Quake Engine Map File id Software
.mapimail
Send To Mail Recipient N/A
.maplet
Maplet World File Blitz Research
.mapsdata
iOS Maps Data File Apple
.mapx
Mapjects Client Webparts File Mapjects Development
.maq
Microsoft Access Query Microsoft
.mar
Mozilla Archive Mozilla
.markdn
Markdown File John Gruber
.markdown
Markdown Documentation File John Gruber
.mars
Adobe MARS File Adobe Systems
.marshal
Marshal Data Migration Model File RISE to Bloome Software
.mart
MartView eBook File MartView
.mas
rFactor Track File Image Space
.mask
SpeedGrade Color Mask File Adobe Systems
.masseffectprofile
Mass Effect Player Profile Electronic Arts
.masseffectsave
Mass Effect Saved Game Electronic Arts
.master
ASP.NET Master Page Microsoft
.mat
MATLAB MAT-File The MathWorks
.material
Rigs of Rods Texture Reference File N/A
.mato
Atomic Combat Saved Game Mojiferous Industries
.mau
Media Attachment Unit N/A
.mav
Access View File Microsoft
.maw
Access Data Access Page Microsoft
.max
3ds Max Scene File Autodesk
.maxc
3ds Max Container File Autodesk
.maz
Hover! Maze File Hover
.mb
Maya Binary Project File Autodesk
.mbb
Kodak EasyShare Data File Kodak
.mbbk
ManaBook Book Kit File ManaBook Software
.mbd
Multimedia Builder Project File MediaChance
.mbf
Microsoft Money Backup File Microsoft
.mbg
Mailbag Assistant Mailbox File Fookes
.mbi
Multi-Bootable Information File MagicISO
.mbk
dBASE IV Multiple Index Backup File dataBased Intelligence
.mbl
Logger Pro Data File Vernier
.mbm
Multi Bitmap File N/A
.mbox
E-mail Mailbox File N/A
.mbp
Mobipocket Notes File Mobipocket
.mbr
Zune Smooth Streaming File Microsoft
.mbs
Opera Mailbox File Opera Software
.mbsa
Microsoft Baseline Security Analyzer File Microsoft
.mbt
Blue Card Manager Merit Badge Template File Scout Management Software
.mbw
MBRWizard Archive Firesage Solutions
.mbx
Outlook Express Mailbox N/A
.mc1
MedCalc Data File MedCalc
.mc2
MasterCook 5 Cookbook File ValuSoft
.mc5
Poser 5 Material File Smith Micro
.mc6
Poser Material Collection File Smith Micro
.mc9
Mastercam 9 Geometry File CNC
.mca
Minecraft "Anvil" Map File Mojang
.mcd
Mathcad Document Parametric Technology Corporation
.mcdx
Mathcad Prime Document PTC
.mcf
MasterCook 2 Cookbook File ValuSoft
.mcfi
Maya Initial Fluid Cache File Autodesk
.mcfp
Maya Fluid Cache Playback File Autodesk
.mcgame
Minecraft Game Backup File Minecraft Launcher
.mci
Media Control Interface File N/A
.mcl
Windows Media Center Link File Microsoft
.mclevel
Minecraft Map File Mojang Specifications
.mcmeta
Minecraft Animation File Mojang
.mco
Live Messenger Winks File Microsoft
.mcp
CodeWarrior Project Freescale Semiconductor
.mcr
3ds Max Macroscript File Autodesk
.mcrp
MobyExplorer Encrypted File Bermin Software
.mcs
Mathcad Image Mathsoft
.mcsp
My Craft Studio Project File Crafting.co.uk
.mcsx
My Craft Studio Professional File Crafting.co.uk
.mcw
Monitor Calibration Wizard File Hex2Bit
.mcworld
Minecraft World Backup File Minecraft Launcher
.mcx
MICRO CADAM-X/6000 Model Data File CNC Software
.mcxe
MedicinesComplete Data File Clinical & Biomedical Computing
.mcz
Compressed Poser Material File Smith Micro
.md
Markdown Documentation File John Gruber
.md0
Alcohol Disk Image Segment 1 Alcohol Software
.md1
GEAR CD/DVD Disc Image N/A
.md2
Quake 2 Player Model id Software
.md3
Quake 3 3D Model id Software
.md5
MD5 Checksum File N/A
.md5.txt
Message Digest 5 Hash File N/A
.md5anim
id Tech 4 Model Animation File id Software
.md5camera
id Tech 4 Model Camera File id Software
.md5mesh
id Tech 4 3D Mesh File id Software
.md8
Mediator Project File MatchWare
.mda
Access Add-in Microsoft
.mdb
Microsoft Access Database Microsoft
.mdbackup
iPhone Data Backup File Apple
.mdbhtml
Microsoft Access Database HTML File Microsoft
.mdc
Multi Dimension Cube File Cognos
.mdd
Point Oven Deformation Data File Point Oven
.mddata
iPhone Backup File Apple
.mde
Compiled Access Add-in File Microsoft
.mdf
Media Disc Image File Alcohol Software
.mdi
Microsoft Document Imaging File Microsoft
.mdinfo
iPhone Backup Information File Apple
.mdl
MathWorks Simulink Model MathWorks
.mdm
HLM Multivariate Data Matrix File Scientific Software International
.mdmp
Windows Minidump Microsoft
.mdn
Blank Access Database Template N/A
.mdown
Markdown File John Gruber
.mdp
Visual C++ 5 Workspace File Microsoft
.mds
Media Descriptor File N/A
.mdt
GeoMedia Access Database Template Intergraph
.mdw
Access Workgroup File N/A
.mdx
Extended Media Descriptor File DT Soft
.mdz
Access Wizard Template N/A
.mdzip
MagicDraw Project Archive No Magic
.me
Readme Text File N/A
.me2mod
Mass Effect 2 Modification File N/A
.meb
PRO100 3D Interior Catalog Element Ecru Software
.med
Amiga MED Sound File RBF Software
.mef
Mamiya RAW Image Mamiya
.meg
MEGA Data File MEGA Team
.mega
Megacubo XML Metafile Megacubo
.mel
Maya Embedded Language File Autodesk
.mell
Mellel Word Processing File RedleX
.mellel
Mellel Word Processing Document RedleX
.mem
FoxPro Variable File N/A
.menc
Windows Mobile Encrypted File Microsoft
.menu
Quake 3 Engine Menu File id Software
.meo
MEO Encrypted Archive NCH Software
.mer
RSView Development Runtime File Rockwell Automation
.merlin2
Merlin Project File ProjectWizards
.merlinlicense
Merlin License File ProjectWizards
.mesh
DirectX Mesh File Microsoft
.met
eMule Resource File eMule
.meta
RealPlayer Metafile RealNetworks
.metadata_never_index
Spotlight Never Index File Apple
.mex
Macro Express File Insight Software Solutions
.mf
Java Manifest File Sun Microsystems
.mfa
Multimedia Fusion Development File Clickteam
.mfcribbon-ms
MFC Ribbon Definition XML File Microsoft
.mfe
MobileFrame Enterprise Data File MobileFrame
.mfil
Blizzard Software Update File Blizzard Entertainment
.mfl
Mozilla FastLoad File Mozilla
.mfo
Perl ModInfo Descriptor File Perl
.mfp
MediaFACE Project File Neato
.mfs
MetFS Encrypted File System EnderUNIX
.mft
MediaFACE Project Template Neato
.mfu
MobileFrame Update File MobileFrame
.mfv
MobileFrame Device Pack File MobileFrame
.mfw
MobileFrame Workflow Pack File MobileFrame
.mfx
Multimedia Fusion Extension Clickteam
.mga
Manga Document Manga Reader
.mgc
Microsoft Clip Organizer Media Catalog Microsoft
.mgcb
Equation Illustrator Project File MGCSoft
.mgdatabase
MacGourmet Deluxe Database File Mariner Software
.mgf
Materials and Geometry Format Lawrence Berkeley National Laboratory
.mgk
ImageMagick Configuration File ImageMagick Studios
.mgl
Age of Empires 2 Replay File Microsoft
.mgm
MGMaps File Mobile GMaps
.mgmf
MindGenius Map File MindGenius
.mgmt
MindGenius 2-3 Template MindGenius
.mgmx
MindGenius XML Map File MindGenius
.mgo
MacGourmet Recipe File Mariner Software
.mgourmet
MacGourmet Deluxe Document Mariner Software
.mgourmet3
MacGourmet Deluxe 3 Document Mariner Software
.mgs
MGCSoft Vector Shapes File MGCSoft
.mgt
Musicnotes Guitar Guru Song File Musicnotes
.mgtheme
MacGourmet Theme File Mariner Software
.mgtx
MindGenius XML Template File MindGenius
.mgv
PSP Video File Sony
.mgx
Age of Empires 2 Expansion Replay File Microsoft
.mhs
Xilinx XPS Hardware Specification File N/A
.mht
MHTML Web Archive N/A
.mhtml
MIME HTML File N/A
.mi4
Audio Player Firmware File NVIDIA
.mic
Image Composer File Microsoft
.mid
MIDI File N/A
.midi
MIDI File N/A
.mif
MapInfo Interchange Format File Pitney Bowes Software
.mig
Windows Migration Backup File Microsoft
.mii
Wii Virtual Avatar File Nintendo
.milk
MilkDrop Winamp Plugin Preset Nullsoft
.mim
Multi-Purpose Internet Mail Message File Internet Engineering Task Force
.mime
Multi-Purpose Internet Mail Extension The Internet Engineering Task Force
.min
Okuma CNC Program File Okuma
.mindnode
MindNode Document Markus Müller
.mine
Minecraft Map File Mojang Specifications
.minesweepersave-ms
Minesweeper Saved Game Microsoft
.mini2sf
Nintendo DS Sound Information File N/A
.minincsf
NCSF Nintendo DS Audio File Naram Qashat
.minipsf
Miniature PlayStation Sound Format File N/A
.minipsf2
Miniature PlayStation Sound Format File N/A
.miniusf
Nintendo 64 Song File N/A
.mint
Linux Mint Installer File Linux Mint
.mio
MioEngine Application File Mioplanet Technologies
.mip
Multiple Image Print File Corel
.mir
Mini-Image Ripper Disc Image Mini-Image Ripper
.mis
Saved Game Mission File N/A
.mission
MissionMaker Project File Immersive Education
.mit
MineEdit Inventory Template File MineEdit
.mix
Microsoft Image Exchange File Microsoft
.mj2
Motion JPEG 2000 Video Clip N/A
.mjd
Adobe Acrobat MIME Encoded Job Definition File Adobe Systems
.mjdoc
MacJournal Document Mariner Software
.mjp
MJPEG Video File LG
.mjpg
Motion JPEG Video File N/A
.mk
Makefile N/A
.mk3d
Matroska 3D Video File Matroska
.mk4
Schiller medilog ECG Raw Data File Schiller
.mka
Matroska Audio File Matroska
.mkv
Matroska Video File Matroska
.ml
ML Source Code File Robin Milner
.mlb
MyLabel Designer Deluxe Project File Avanquest Software
.mlc
Microsoft Language Interface Pack Microsoft
.mlk
MasterCook Look File ValuSoft
.mll
Maya Plugin Autodesk, Inc.
.mlp
Meridian Lossless Packing Audio File Meridian Audio
.mls
Milestones Simplicity File KIDASA
.mm
Objective-C++ Source File N/A
.mm6
Money Manager 6 File Moneysoft
.mm7
Might and Magic 7 Saved Game N/A
.mm8
Might and Magic 8 Saved Game 3DO
.mma
Master Album Maker Photo Album File Intrepid Mouse
.mmap
MindManager Map File Mindjet
.mmat
MindManager Map Template Mindjet
.mmc
Microsoft Media Catalog Microsoft
.mmcollection
Mail Manager Collection File Oasys
.mmdc
MediaMonkey Device Configuration File Ventis Media
.mme
Multi-Purpose Internet Mail N/A
.mmf
Synthetic Music Mobile Application File Yamaha
.mmip
MediaMonkey Installation Package Ventis Media
.mml
FrameMaker Maker Markup Language File Adobe Systems
.mmm
Music Maker Arrangement File MAGIX AG
.mmo
Memory Map Overlay File Memory-Map
.mmp
Symbian Project Specification File Nokia
.mmu
myPM Merge Data File Midori Media
.mmv
MicroMV Video File Sony
.mmw
AceMoney Money File MechCAD Software
.mnc
My Notes Center Notebook BC
.mng
Multiple Network Graphic N/A
.mnh
Master Navigator Header File Sapper Oy
.mnk
My Notes Keeper Notebook Wpg Computing
.mnl
AutoCAD Menu LISP File Autodesk
.mnm
Character Studio Marker Name File Autodesk
.mno
Macromedia Design Note Adobe Systems
.mnr
AutoCAD Menu Resource File Autodesk
.mns
AutoCAD Interface Settings File Autodesk
.mnt
FoxPro Menu Memo N/A
.mnu
AutoCAD Interface Layout File Autodesk
.mnv
PlayStation Movie File Sony
.mnx
FoxPro Menu N/A
.mny
Microsoft Money File Microsoft
.mo
Machine Object File N/A
.mo3
MO3 Audio File Un4seen Developments
.mob
MOBTV Video File MediaCorp
.mobi
Mobipocket eBook Amazon
.mobileconfig
Apple Mobile Configuration File Apple
.mobileprovision
Xcode Mobile Provisioning Profile Apple
.mod
Amiga Music Module File N/A
.modd
Sony Video Analysis File Sony
.mode
Coda Syntax Mode File Panic
.model
CATIA 3D Model FIle Dassault Systemes
.module
Drupal Module File Drupal
.mof
Managed Object Format File Desktop Management Task Force
.moff
Sony Video Analysis Index File Sony
.mogg
Multitrack Ogg File N/A
.moho
Anime Studio Animation Project Smith Micro
.moi
MOI Video File N/A
.mol
MDL Molfile Symyx Technologies
.mom
Managed Object Model Apple
.momma
Offspring Fling Replay File KPULV
.money
Money Data File Jumsoft
.moneywell
MoneyWell Account File No Thirst Software
.montage
Montage Screenplay File Mariner Software
.moov
Apple QuickTime Movie Apple
.mos
Leaf Camera RAW File Leaf Imaging
.mosaic
MacOSaiX Mosaic File Frank M. Midgley
.mot
LightWave Motion File NewTek
.mou
WinMount Compressed File WinMount International
.mov
Apple QuickTime Movie Apple
.movie
QuickTime Movie File Apple
.mox
ExtendSim Simulation Software Model Imagine That
.moz
Mozilla Cache File N/A
.mp
Maya PLE Project File Autodesk
.mp1
MPEG-1 Layer 1 Audio File N/A
.mp10
Multisim 10 Project File National Instruments
.mp11
Multisim 11 Project File National Instruments
.mp2
MPEG Layer II Compressed Audio File Moving Picture Experts Group
.mp21
MPEG-21 Multimedia File N/A
.mp2m
Max Payne 2 Mod File Rockstar Games
.mp2s
Max Payne 2 Saved Game Rockstar Games
.mp2v
MPEG-2 Video File N/A
.mp3
MP3 Audio File Moving Picture Experts Group
.mp4
MPEG-4 Video File Moving Picture Experts Group
.mp4.infovid
Parrot AR Drone and Gyro Flyer Video N/A
.mp4v
MPEG-4 Video Moving Picture Experts Group
.mp7
Multisim 7 Project File National Instruments
.mp9
Multisim 9 Project File National Instruments
.mpa
MPEG-2 Audio File N/A
.mpb
MyPhoneExplorer Backup File Franz Josef Wechselberger
.mpc
Musepack Compressed Audio File Musepack
.mpcpl
Media Player Classic Playlist Media Player Classic
.mpd
Microsoft Project Database Microsoft
.mpdconf
Music Player Daemon File The MPD Team
.mpdp
MixPad Project File NCH Software
.mpe
MPEG Movie File N/A
.mpeg
MPEG Movie N/A
.mpeg1
MPEG-1 Video File N/A
.mpeg4
MPEG-4 File N/A
.mpf
Microsoft Media Package FIle Microsoft
.mpg
MPEG Video File N/A
.mpg2
MPEG-2 Video File N/A
.mpga
MPEG-1 Layer 3 Audio File N/A
.mpgindex
Adobe MPEG Index File Adobe Systems
.mpi
InstallJammer Project File The InstallJammer Team
.mpj
RoboHelp HTML Project Adobe Systems
.mpk
ArcGIS Map Package ESRI
.mpkg
Meta Package File N/A
.mpl
AVCHD Playlist File Sony
.mpls
Blu-ray Movie Playlist File Blu-ray Disc Association
.mpm
Max Payne Modfication File Rockstar Games
.mpo
Multi Picture Object File CIPA
.mpp
Microsoft Project File Microsoft
.mppz
MagicPlot Project File Magicplot Systems
.mpr
FoxPro Generated Menu Program N/A
.mps
Pocket Streets Map File Microsoft
.mpsub
MPlayer Subtitles File MPlayer
.mpt
Microsoft Project Template Microsoft
.mpu
MPEG Layer 3 Audio File N/A
.mpv
MPEG Elementary Stream Video File Moving Picture Experts Group
.mpv2
MPEG-2 Video Stream N/A
.mpw
Microsoft Project Workspace File Microsoft
.mpx
Microsoft Project Exchange File Microsoft
.mpz
Miradi Project File Benetech
.mpzip
Multisim Pack File National Instruments
.mp_
Mobile Phone Sound File N/A
.mq4
MetaTrader Custom Indicator MetaQuotes Software
.mqo
Metasequoia Document Metasequoia
.mqv
Sony Movie Format File Sony
.mrb
Multiple Resolution Bitmap File Microsoft
.mrc
mIRC Script File mIRC
.mrg
MySQL Merge File MySQL
.mrimg
Macrium Reflect Disk Image Paramount Software UK
.mrk
DPOF Auto Print Order File N/A
.mrml
3D Slicer Scene Description File BWH
.mrs
GunZ Game Data File MAIET Entertainment
.mrt
Stimulsoft Report File Stimulsoft
.mrw
Minolta Raw Image File Minolta
.mrxs
MIRAX Virtual Slide File Carl Zeiss MicroImaging
.ms
3ds Max Script File Autodesk
.ms-tnef
MS Transport Neutral Encapsulation Format Microsoft
.ms1
VirtualBus Map File VIrtualBus
.ms10
Multisim 10 Circuit Design File National Instruments
.ms11
Multisim 11 Circuit Design File National Instruments
.ms3d
MilkShape 3D Model Chumbalum Soft
.ms7
Multisim 7 Circuit Design File National Instruments
.ms8
Multisim 8 Circuit Design File National Instruments
.ms9
Multisim 9 Circuit Design File National Instruments
.msb
Oracle Binary Message File Oracle
.msc
Microsoft Management Console Snap-in Control File Microsoft
.mscx
MuseScore Music Score File The MuseScore Team
.mscz
MuseScore Compressed Score File The MuseScore Team
.msd
Map Service Definition File ESRI
.msdvd
Windows DVD Maker Project File Microsoft
.mse
3ds Max Encrypted MAXScript File Autodesk
.msf
Mail Summary File N/A
.msg
Outlook Mail Message Microsoft
.msh
Orbiter 3D Mesh File Martin Schweiger
.msha
Microsoft Help Asset File Microsoft
.mshc
Microsoft Help Container File Microsoft
.mshi
Microsoft Help Index File Microsoft
.msi
Windows Installer Package Microsoft
.msif
MyLabel Designer Deluxe Data File Avanquest
.msk
Paint Shop Pro Mask File Corel
.mskn
MediaMonkey Skin File Ventis Media
.msl
Mapping Specification Language File Microsoft
.msm
Windows Installer Merge Module Microsoft
.msn
Host Blocking File Microsoft
.mso
Inline E-mail Attachment Microsoft
.msp
Windows Installer Patch Microsoft
.mspx
Microsoft ASP.NET Web Page Microsoft