| .m4r |
iPhone Ringtone File |
| .mxl |
Compressed MusicXML File |
| .mmp |
Symbian Project Specification File |
| .m3u8 |
UTF-8 M3U Playlist File |
| .mmf |
Meal-Master Recipe File |
| .mp2 |
Heroes of Might and Magic II Map File |
| .mpc |
Musepack Compressed Audio File |
| .mtm |
MultiTracker Module |
| .med |
Amiga MED Sound File |
| .mtf |
Multi Tracker File |
| .m4p |
iTunes Music Store Audio File |
| .ma1 |
Monarch Audio File |
| .mus |
Finale Notation File |
| .mte |
MadTracker 2 Envelope |
| .mti |
MadTracker Instrument |
| .mtp |
MadTracker 2 Pattern |
| .mdc |
Multi Dimension Cube File |
| .mui |
Myriad User Instrument File |
| .miniusf |
Nintendo 64 Song File |
| .mka |
Matroska Audio File |
| .mpga |
MPEG-1 Layer 3 Audio File |
| .mzp |
MAXScript Zip Package |
| .mgv |
PSP Video File |
| .mo3 |
MO3 Audio File |