| 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 |
| mdf | Star Trek: Armada Game Data |
| mdl | Half-Life Game Model Data |
| Men of War: Assault Squad 2 Model Data |
| Microsoft Flight Simulator Model Data |
| Quake 3D Model Data |
| Warcraft 3 Text Model Data |
| mdlx | Kingdom Hearts 2 Model |
| mdm | Mario Dash Map Data |
| mdt | Delta Force Bump Map Data |
| mdu | The Suffering: Ties That Bind Game MDU Data |
| mdx | Warcraft 3 Binary Model Data |
| me2headmorph | Mass Effect 2 Head Morph Data |
| me2mod | Mass Effect 2 Modification |
| med | Aquazone Medication Data |
| meg | Star Wars: Empire at War Data |
| mega2 | Doom Texture Package |
| mek | Gearhead Garage Game Data |
| melmod | Melon Playground Mod |
| melon | BONEWORKS Custom Item |
| melsave | Melon Playground Saved Game |
| menu | Infinity Engine Menu Data |
| Quake 3 Engine Menu |
| meshworld | Hamsterball Level Data |
| met | Dragon Age: Origins Saved Game |
| mfmod | Mobile Forces Game Mod |
| mgg | MegaGlest Game Configuration Data |
| mgh | Minigolf Adventures Deluxe Game 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 |
| Rise of Nations Saved Game |
| mgz | Metal Gear Solid Archive |
| mhd | Fallout 3 MHD Data |
| mhk | Myst Game Data |
| Riven Movie Data |
| mii | Nintendo Wii Virtual Avatar |
| mine | Minecraft Map Data |
| minesweepersave-ms | Minesweeper Saved Game |
| mio | WarioWare D.I.Y. Microgame Data |
| mis | Delta Force: Land Warrior Mission Data |
| Marble Blast Gold Mission |
| Tribes 2 Game Mission Data |
| miss | Homeworld Missile Data |
| mission | Anno 2070 Mission Information |
| Vega Strike Mission Data |
| mix | Command and Conquer MIX Data |
| MotoGP Game Data |
| mjo | Thief Mesh Joints Data |
| mkr | Train Simulator Marker Data |
| mlx | Starcraft Saved Game |
| mm | Rise of Nations Campaign Media Data |
| Transport Fever Game Cache Data |
| mm6 | Might and Magic VI Saved Game |
| mm7 | Might and Magic VII Saved Game |
| mm8 | Might and Magic VIII Saved Game |
| mmh | Dragon Age Model Mesh Hierarchy Data |
| mml | Aleph One Marathon Markup Language Code |
| mmp | Grand Theft Auto Multiplayer Map |
| mmx | Command and Conquer Map |
| mn2 | Descent 2 Mission Data |
| mn3 | Descent 3 Mission Data |
| mni | Star Trek Elite Force 2 Data |
| mnu | Delta Force Menu Data |
| mo | Transport Fever Game Text Data |
| mob | Master of Orion 3 Game Data |
| mod | Neverwinter Nights Game Module |
| mod3 | Monster Hunter World 3D Model Data |
| model | Stronghold 3 Model Data |
| Warhammer 40000: Dawn of War 2 Model Data |
| modinfo | Civilization V Mod Information |
| modpak | Starbound Mod Package |
| modpkg | Minecraft PE Mod Package |
| mog | FootBall Mogul Data |
| momma | Offspring Fling Replay Data |
| mon | Monopoly Deluxe Game Data |
| mop | Dragon Age Player Data |
| mor | Dragon Age Toolset Head Morph |
| mos | Infinity Engine Bitmap Data |
| mountain | A Short Hike Saved Game |
| mov | ROSE Online Movie Data |
| movie | Payday Game Movie |
| mp2 | Heroes of Might and Magic II Map |
| mp2m | Max Payne 2 Mod Data |
| mp2s | Max Payne 2 Saved Game |
| mpak | Battlestations: Midway Data |
| mpd | Vagrant Story Map Data |
| mpk | Painkiller Overdose Map Data |
| Wolfenstein 2009 Game Data |
| mpm | Max Payne Modfication |
| mpq | MoPaQ Archive |
| mpr | Live for Speed Multiplayer Replay |
| mps | Max Payne Saved Game |
| mpz | Red Eclipse Map Data |
| mqo | Runescape 2 Game Data |
