| md5anim | MD5 Model Animation |
| md5camera | Doom 3 Model Camera Data |
| md5mesh | MD5 Model Data |
| md6anim | Doom 4 Animation Data |
| md6mesh | Doom 4 Model Data |
| mdc | Return to Castle Wolfenstein Model Data |
| mddbs | Manic Digger Database |
| mdl | Microsoft Flight Simulator Model Data |
| mdl | Quake 3D Model Data |
| mdlx | Kingdom Hearts 2 Model |
| me2mod | Mass Effect 2 Modification |
| meg | Star Wars: Empire at War Data |
| menu | Infinity Engine Menu Data |
| menu | Quake 3 Engine Menu |
| mgg | MegaGlest Game Configuration Data |
| mgl | Age of Empires 2 Replay |
| mgn | Star Wars: Galaxies 3D Model |
| mgsv | Metal Gear Solid V Mod Archive |
| mgx | Age of Empires II: The Conquerors Data |
| mgx | Rise of Nations Saved Game |
| mgz | Metal Gear Solid Archive |
| mhk | Myst Game Data |
| mii | Nintendo Wii Virtual Avatar |
| mine | Minecraft Map Data |
| minesweepersave-ms | Minesweeper Saved Game |
| mis | Marble Blast Gold Mission |
| mission | Anno 2070 Mission Information |
| mjo | Thief Mesh Joints Data |
| mlx | Starcraft Saved Game |
| mm7 | Might and Magic VII Saved Game |
| mm8 | Might and Magic VIII Saved Game |
| mmh | Dragon Age Model Mesh Heirarchy Data |
| mmx | Command and Conquer Map |
| mn2 | Descent 2 Mission Data |
| mn3 | Descent 3 Mission Data |
