| 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 |
| mcr | BricsCAD Macro Data |
| mcr | CuteFTP Script |
| mcr | General CADD Macro |
| mcr | Macro ToolsWorks Macro Data |
| mcr | MCreator Workspace |
| mcr | Perfect Keyboard Macro |
