| .mlp |
Meridian Lossless Packing Audio File |
| .mscx |
MuseScore Music Score File |
| .mx5template |
Mixcraft 5 Audio Project Template |
| .mx4 |
Mixcraft 4 Audio Project |
| .mx3 |
Mixcraft 3 Audio Project |
| .mu3 |
Myriad Packed Musical Score |
| .mogg |
Multitrack Ogg File |
| .minipsf |
Miniature PlayStation Sound Format File |
| .minipsf2 |
Miniature PlayStation Sound Format File |
| .msmpl_all |
Korg microSAMPLER Backup File |
| .mt9 |
MT9 Audio File |
| .musa |
Aleph One Music File |
| .muz |
MUZ Audio File |
| .mini2sf |
Nintendo DS Sound Information File |
| .minincsf |
NCSF Nintendo DS Audio File |
| .mwand |
GarageBand MagicMentor Template |
| .nki |
KONTAKT Instrument File |
| .nra |
Nero Audio Compilation |
| .nbs |
Minecraft Note Block Studio File |
| .nsf |
NES Sound Format File |
| .nwc |
NoteWorthy Composer File, CAD Cache File |
| .ntn |
NOTION Song File |
| .nrt |
Nokia Ringtone |
| .nsa |
Nullsoft Streaming Audio File |