| cmbd | GMI WellCheck Combined File |
| cmbl | Vernier Logger Pro Data |
| cmc | Comic Collector Collection Data |
| cmd5 | CrystalMaker V5 Data File |
| cmdb | CFX Mesh Database |
| cmdf | CrystalMaker V2 Data File |
| cmdl | Cafu Engine Model Data |
| cmdrw | CET Designer Drawing Data |
| cmdt | ClarisWorks Dictionary Data |
| cmf | Cal3D Binary Mesh Data |
| cmf | CIFMIF File |
| cmf | CorelDraw Metafile |
| cmf | PBD-14 CMF Data |
| cmfav | CET Designer Favorites Data |
| cmfrl | CET Designer Furniture Layout Data |
| cmh | PLINK Cochran Mantel Haenszel 2x2xK Test Report |
| cmh2 | PLINK Cochran Mantel Haenszel IxJxK Test Report |
| cmi | Camomile Interface Data |
| cmj | ControlMyJoystick Profile |
| cml | Chemical Markup Language File |
| cml | CryptoMailer Encrypted File |
| cml | Filetopia Collection Manager List |
| cmlast | CET Designer Last Drawing Backup |
| cmlock | CET Designer Lock Data |
| cmm | ColorSync Utility CMM Data |
| cmm | Corel Multimedia Manager v7 Album |
| cmmtheme | CleanMyMac Theme Data |
| cmn | Microsoft SMS Collection Membership Update |
| cmo | 3DVIA Virtools Behavioral Server Composition |
| cmo | Visual3D C-Motion Output Data |
