M3U8-MP3-Playlist-File-UTF-8
M3U8-Unicode-version-of-M3U-playlist-file-UTF-8-Winamp-XMMS
M3U-MPEG-URL-MIME-audio-file-MP3-Playlist
M3URL-MP3-Playlist-File
M3V-DJ-Mix-Pro-playlist-file
M3X-Unknown-file-extension
M4A-Protected-AAC-audio-file-possibly-from-iTunes-Music-Store
M4A-Unprotected-AAC-audio-file
M4B-MPEG-4-Audio-Layer-Bookmarkable-File
M4C-IBM-Voice-Type-Language-Newuser-File
M4E-MPEG-4-Video-File
M4I-IBM-Voice-Type-languages-Newuser-file
M4-M4-Preprocessor-file-Unix
M4P-MPEG-4-Video-File
M4R-Apple-iPhone-ringtone-format
M4R-iPhone-Ringtone-File
M4R-Ringtone-File
M4S-Myst-IV-Revelation-Saved-Game-Cyan-Worlds-Inc
M4T-Sage-Mas-200-Table-File-Sage-Software
M4U-MPEG-4-Playlist
M4U-Ogg-Media-Redirector-File
M4V-MPEG-4-video-file
M64-Mupen64-Movie-Capture
M64-mupen64-movie-capture-Header
M68-Turbo-Pascal-DOS-file
M68-Turbo-Pascal-DOS-File-Borland-Software-Corporation
M75-Apple-MPEG-1-Video-Apple-Inc
M7A-Mapking-Map-Matlas-Technologies-Inc
M7-Farallon-s-MacRecorder-Format-Sampling-Rate-7k
M7P-Multilizer-2007-and-2009-localization-project-file-Multilizer
M8-Grlib-scry-pcserv-file
M8-Heretic-II-MipMap-image-format
M-93-Director-4-Document
M-95-Director-5
M99-M99-compressed-data
M99-M99-Compression-Algorithm-Compressed-File-Michael-Masicalco
MA0-Diablo-II-Blizzard-Entertainment
MA1-Diablo-II-Blizzard-Entertainment
MA1-Monarch-Audio-File
MA2-Diablo-II-Blizzard-Entertainment
MA2-Unknown-Apple-II-File
MA3-Macro-Harvard-Graphics-3-0
MA-Autodesk-Maya-ASCII-Scene
MAB-Mozilla-Address-Book
MAB-Mozilla-Netscape-Personal-Address-book-File
MAB-Mozilla-Netscape-Personal-Addressbook-or-Collected-Addressbook-Mozilla
MACA-MAC-CREATOR-CODE-Mac-Write-4-6-5
MACA-Mac-File-Type
MACA-MacWrite-2-2
MACBIN-MacBinary-archive
TechTarget file types