File Extension M - Limbo Interface Declaration , etc
File Extension M$S - MindStor Firmware Update File , etc
File Extension M01 - MicroStation Modification Resource (Bentley Systems, Incorporated), etc
File Extension M0D - Malete Options (Record 0) File (OpenIsis), etc
File Extension M11 - MASS11 Text File , etc
File Extension M12 - SHARP MZ-series Emulator File , etc
File Extension M14 - Steuer2001 File , etc
File Extension M15 - Apple MPEG-1 Video (Apple Inc.), etc
File Extension M18 - Accolade Golf Course File , etc
File Extension M1A - Apple MPEG-1/2 Audio (Apple Inc.), etc
File Extension M1C - IBM Voice Type Language Newuser File , etc
File Extension M1I - IBM Voice Type Language Newuser File , etc
File Extension M1PG - iFinish Video Clip (Media 100 Inc.), etc
File Extension M1S - MPEG Media File , etc
File Extension M1V - MPEG-1 Video File , etc
File Extension M2 - Modula 2 Language Source , etc
File Extension M21 - AXMEDIS MPEG-21 File (AxMediaTech S.R.L.), etc
File Extension M22 - Farallon's MacRecorder Format Sampling Rate 22k , etc
File Extension M29 - Turbo Smetchik (Data Basis), etc
File Extension M2A - Apple MPEG-1/2 Audio (Apple Inc.), etc
File Extension M2C - IBM Voice Type Language Newuser File , etc
File Extension M2I - IBM Voice Type Language Newuser File , etc
File Extension M2O - Modula Fitted Modula2 File , etc
File Extension M2P - MPEG-2 Program Stream Format File , etc
File Extension M2S - MPEG-2 Audio and Video , etc
File Extension M2TS - Blu-ray BDAV MPEG-2 Transport Stream (Blu-ray Disc Association), etc
File Extension M2V - MPEG-2 Video Only File , etc
File Extension M3 - Modula 3 Program File , etc
File Extension M32 - Dr.T MIDI File , etc
File Extension M3A - MPEG Archive Enhanced .M3U Playlist File , etc
File Extension M3C - IBM Voice Type Language Newuser File , etc
File Extension M3D - Corel Motion 3D Animation , etc
File Extension M3G - Mobile 3D Graphic , etc
File Extension M3I - IBM Voice Type Language Newuser File , etc
File Extension M3S - Myst III Exile Saved Game (Cyan Worlds, Inc.), etc
File Extension M3U - MP3 Playlist File , etc
File Extension M3U8 - MP3 Playlist File (UTF-8) , etc
File Extension M3URL - MP3 Playlist File , etc
File Extension M4 - m4 Macro , etc
File Extension M4A - MPEG-4 Audio Layer , etc
File Extension M4B - MPEG-4 Audio Layer Bookmarkable File , etc
File Extension M4C - IBM Voice Type Language Newuser File , etc
File Extension M4I - IBM Voice Type Language Newuser File , etc
File Extension M4P - Protected AAC File (Apple Inc.), etc
File Extension M4R - iPhone Ringtone (Apple Inc.), etc
File Extension M4S - Myst IV: Revelation Saved Game (Cyan Worlds, Inc.), etc
File Extension M4U - Ogg Media Redirector File , etc
File Extension M4V - MPEG-4 Video File , etc
File Extension M64 - Mupen64 Movie Capture , etc
File Extension M68 - Turbo Pascal DOS File (Borland Software Corporation), etc
File Extension M7 - Farallon's MacRecorder Format Sampling Rate 7k , etc
File Extension M75 - Apple MPEG-1 Video (Apple Inc.), etc
File Extension M7A - Mapking Map (Matlas Technologies, Inc), etc
File Extension M8 - Grlib Scry PCserv File , etc
File Extension M?? - Ingres Modify Table/Index File (Computer Associates International, Inc.), etc
File Extension MA - Maya ASCII Scene (Alias Systems, a division of Silicon Graphics Limited), etc
File Extension MA0 - Diablo II (Blizzard Entertainment), etc
File Extension MA1 - Diablo II (Blizzard Entertainment), etc
File Extension MA2 - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MA3 - Diablo II (Blizzard Entertainment), etc
File Extension MAB - Mozilla (Netscape) Personal Addressbook or Collected Addressbook (Mozilla), etc
File Extension MAC - MacPaint Bitmap Graphic , etc
File Extension MAC2 - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MAC3 - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MAC4 - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MACAPP - MacDrive (Mediafour Corporation), etc
File Extension MACHAC - MacHacha Split Control File (Pescados Software), etc
File Extension MACHIN - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MACHTY - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MACP - MacPaint Bitmap Graphic , etc
File Extension MACR - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MACRO - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MACRO2 - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MACRO3 - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MACROS - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MACS - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MACWRI - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MAD - Access Module Shortcut (Microsoft Corporation), etc
File Extension MADNES - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MADONN - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MADSTA - Homeworld Model Animation Script (Sierra Entertainment, Inc.), etc
File Extension MAE - Maestro Molecular Model (Schrödinger, LLC), etc
File Extension MAEGZ - Maestro Compressed Molecular Model (Schrödinger, LLC), etc
File Extension MAF - Access (Microsoft Corporation), etc
File Extension MAFF - Firefox Mozilla Archive Format Extension Saved Web Page Archive (Mozilla), etc
File Extension MAG - Magic Mail Monitor Mailbox File , etc
File Extension MAGIC - Magic Mail Monitor Mailbox , etc
File Extension MAGNET - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MAGS - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MAH - Mahjongg Solitaire Settings , etc
File Extension MAHJON - Mahjong Titans Saved Game (Microsoft Corporation), etc
File Extension MAI - Sony Video Thumbnail (Sony Corporation of America), etc
File Extension MAIL - NeoPlanet Mail Client , etc
File Extension MAILAB - MSN AddressBook View (Microsoft Corporation), etc
File Extension MAILBO - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MAILHO - E-mail Server Preferences File (Microsoft Corporation), etc
File Extension MAILOR - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MAILSR - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension MAILVI - MSN Mail Message List (Microsoft Corporation), etc
File Extension MAIN - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc