| .mix |
Command & Conquer Data File |
| .mis |
Marble Blast Gold Mission File |
| .mp2m |
Max Payne 2 Mod File |
| .mf |
Java Manifest File |
| .mrs |
GunZ Game Data File |
| .mgx |
Rise of Nations Saved Game |
| .mgl |
Age of Empires 2 Replay File |
| .mcr |
Minecraft Region File |
| .md3 |
Quake 3 3D Model |
| .mp2s |
Max Payne 2 Saved Game |
| .m2 |
World or Warcraft Model Object |
| .mpz |
Miradi Project File |
| .mdm |
HLM Multivariate Data Matrix File |
| .mio |
MioEngine Application File |
| .menu |
Quake 3 Engine Menu File |
| .mii |
Wii Virtual Avatar File |
| .mpk |
Project64 Memory Pack File |
| .mae |
My Avatar Editor Character File |
| .minesweepersave-ms |
Minesweeper Saved Game |
| .maplet |
Maplet World File |
| .mas |
rFactor Track File |
| .mcworld |
Minecraft World Backup File |
| .mca |
Minecraft Anvil map file |
| .mode |
Coda Syntax Mode File |