| mc4 | MicroCase v4 Data File |
| mc4d | Maxon Cinema 4D Object |
| mc5 | Poser 5 Material Collection |
| mc6 | Poser 6 Material Collection |
| mca | Apis Ceratina Data |
| mcacc | MCACC Measurement Data |
| mcapm | PocketMine-MP Minecraft Anvil Data |
| mcat | Meerecat File Guard Encrypted Data |
| mcb | NEPLAN Root Network Data |
| mcc | Amiga MUI External Class Data |
| mcc | Mathcad Configuration Data |
| mcd | Bleem! Memory Card Save Data |
| mcd | MiniCAD Design Data |
| mcdata | MCData XML Data |
| mcdb | Media Cache Database |
| mcf | MARS Component Data |
| mcf | MPRESS Control Format File |
| mcf | SignIQ Media Collection |
| mcf | TMPGEnc Conversion Template |
| mcfi | Autodesk Maya Initial Fluid Cache |
| mcfp | Autodesk Maya Fluid Cache Playback |
| mchelp | MadCap Flare DotNet Help Data |
| mcif | Macromolecular CIF File |
| mck | Macro Keys Encrypted Macro |
| mcl | MCell Cellular Automata Data |
| mcl | MUSHclient World Information |
| mcl | SmartCAM Macro File |
| mcmac | MasterCook Mac Document |
| mcmc | MrBayes MCMC Data |
| mcml | Windows Media Center Markup Language File |
| mcp | Amiga MUI Preference Class Data |
| mcp | Mathcad Printer Driver |
| mcp | Megacubo Package |
| mcpr | Minecraft Replay Mod Replay |
| mcr | Autodesk 3D Studio Max Macroscript |
