| M2 | PC-98 Game Music File | Game Files | 2 | 2 |
| M3S | Myst III Exile Saved Game |
Game Files
| 1 | 1 |
| M4S | Myst IV: Revelation Save Game File |
Game Files
| 2 | 2 |
| M8 | Heretic II MipMap Image File |
Game Files
| 1 | 1 |
| M8M | 8mam8 Game Data File |
Game Files
| 1 | 1 |
| MA | Maya Project File |
Game Files
| 3 | 3 |
| MA2 | Diablo II Map File |
Game Files
| 3 | 3 |
| MAD | Electronic Arts Madcow Movie File |
Game Files
| 5 | 2 |
| MAE | My Avatar Editor Character File |
Game Files
| 2 | 2 |
| MAP | Quake Engine Map File |
Game Files
| 36 | 26 |
| MAPLET | Maplet World File |
Game Files
| 1 | 1 |
| MAS | rFactor Track File |
Game Files
| 5 | 5 |
| MAX | 3ds Max Scene File |
Game Files
| 7 | 4 |
| MAZ | MAZ |
Game Files
| 1 | 1 |
| MB1 | Monster Bash Game Data File |
Game Files
| 3 | 3 |
| MCA | Minecraft "Anvil" Map File |
Game Files
| 3 | 2 |
| MCLEVEL | Minecraft Map File |
Game Files
| 1 | 1 |
| MCR | Minecraft Region File |
Game Files
| 5 | 4 |
| MCWORLD | Minecraft World Backup File |
Game Files
| 4 | 1 |
| MD | Markdown Documentation File |
Game Files
| 17 | 7 |
| MD2 | Alcohol Disk Image Segment 2 |
Game Files
| 3 | 2 |
| MD3 | Quake 3 3D Model |
Game Files
| 4 | 1 |
| MDL | MathWorks Simulink Model |
Game Files
| 13 | 8 |
| MDM | HLM Multivariate Data Matrix File |
Game Files
| 3 | 3 |
| MEG | MEGA Data File |
Game Files
| 2 | 2 |
| MEM | FoxPro Variable File |
Game Files
| 9 | 9 |
| MENU | Quake 3 Engine Menu File |
Game Files
| 7 | 3 |
| MF | Gameplay Multifile |
Game Files
| 6 | 3 |
| MGL | Age Of Empires 2 Replay File |
Game Files
| 2 | 2 |
| MGX | Rise Of Nations Saved Game |
Game Files
| 4 | 3 |
| MGZ | Metal Gear Solid Archive File |
Game Files
| 1 | 1 |
| MII | Wii Virtual Avatar File |
Game Files
| 1 | 1 |
| MINE | Minecraft Map File |
Game Files
| 1 | 1 |
| MIS | Marble Blast Gold Mission File |
Game Files
| 2 | 1 |
| MIX | Microsoft Image Exchange File |
Game Files
| 10 | 8 |
| MKR | Train Simulator Marker File |
Game Files
| 2 | 2 |
| MLX | MATLAB Live Script |
Game Files
| 2 | 2 |
| MM | Kodak EasyShare Thumbnail Cache File |
Game Files
| 11 | 8 |
| MMR | Fuji Xerox Fax Image |
Game Files
| 3 | 3 |
| MMX | Command And Conquer Game Data |
Game Files
| 2 | 2 |
| MN2 | Descent 2 Mission File |
Game Files
| 2 | 2 |
| MO | Dymola Simulation File |
Game Files
| 6 | 6 |
| MOB | MOBTV Video File |
Game Files
| 2 | 2 |
| MOD | Amiga Music Module File |
Game Files
| 20 | 9 |
| MON | Firefox Monday Bookmark Backup File |
Game Files
| 3 | 3 |
| MOR | Corel Shared Writing Tools Data |
Game Files
| 3 | 3 |
| MOS | Leaf Camera RAW File |
Game Files
| 10 | 3 |
| MP2 | Heroes Of Might And Magic II Map File |
Game Files
| 6 | 2 |
| MP2M | Max Payne 2 Mod File |
Game Files
| 1 | 1 |
| MP2S | Max Payne 2 Saved Game |
Game Files
| 1 | 1 |
| MPK | ArcGIS Map Package |
Game Files
| 2 | 2 |
| MPM | Max Payne Modification File |
Game Files
| 2 | 2 |
| MPN | Mophun Game File |
Game Files
| 1 | 1 |
| MPQ | Blizzard Mo'PaQ File |
Game Files
| 2 | 1 |
| MPR | Bibexcel Data |
Game Files
| 9 | 9 |
| MPS | Mathematical Programming System File |
Game Files
| 7 | 3 |
| MPZ | Miradi Project File |
Game Files
| 4 | 4 |
| MQO | Metasequoia Document |
Game Files
| 2 | 2 |
| MRK | DPOF Auto Print Order File |
Game Files
| 2 | 2 |
| MRS | GunZ Game Data File |
Game Files
| 3 | 2 |
| MS1 | VirtualBus Map File |
Game Files
| 1 | 1 |
| MSG | Saved Email Message |
Game Files
| 11 | 6 |
| MSH | Orbiter 3D Mesh File |
Game Files
| 6 | 6 |
| MSN | Host Blocking File |
Game Files
| 3 | 3 |
| MSX | Age Of Empires II Saved Game |
Game Files
| 2 | 1 |
| MT | 1830 Railroads And Robber Barons Game Data |
Game Files
| 1 | 1 |
| MTR | RealFight Radio Control File |
Game Files
| 2 | 2 |
| MTV | MTV Video Format File |
Game Files
| 6 | 3 |
| MUL | Ultima Online Multi File |
Game Files
| 1 | 1 |
| MUS | Finale Notation File |
Game Files
| 4 | 4 |
| MW0 | Super Mario World File |
Game Files
| 1 | 1 |
| MW4 | MechWarrior Game Structure File Archive |
Game Files
| 1 | 1 |
| MWM | Space Engineers Model |
Game Files
| 3 | 3 |
| MYS | Vineyard Captured Video File |
Game Files
| 2 | 2 |
| MYT | AI Aircraft Traffic Database File |
Game Files
| 1 | 1 |
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