| .mul |
Ultima Online Multi File |
| .mahjongtitanssave-ms |
Mahjong Titans Saved Game |
| .mcserver |
Minecraft Server File |
| .mwl |
Super Mario World Level |
| .mcpack |
Minecraft Resource Pack File |
| .me2mod |
Mass Effect 2 Modification File |
| .mine |
Minecraft Map File |
| .mission |
Vega Strike Mission File |
| .ms1 |
VirtualBus Map File |
| .mcgame |
Minecraft Game Backup File |
| .mm6 |
Might and Magic 6 Saved Game |
| .min |
Okuma CNC Program File |
| .momma |
Offspring Fling Replay File |
| .mcmeta |
Minecraft Animation File |
| .mx2 |
MasterCook Recipe File, Heroes of Might and Magic II (HOMM2) Game Map File |
| .mddbs |
Manic Digger Database |
| .mad |
Electronic Arts Madcow Movie File |
| .mwps |
Need for Speed: Most Wanted Car Attributes File |
| .modpkg |
Minecraft Pocket Manager File |
| .mcfunction |
Minecraft Commands Function File |
| .mcaddon |
Minecraft Pack Addon File |
| .mctemplate |
Minecraft World Template |
| .mwm |
Space Engineers 3D Model File |
| .mm7 |
Might and Magic 7 Saved Game |