| cma | Filetopia Collection Manager Data |
| cmac | CICS CMAC Messages Data Set |
| cmap | CmapTools Concept Map |
| cmautosave | CET Designer Drawing Autosave |
| cmax | CMax Circuit Data |
| cmb | Chromeleon Backup Archive |
| cmb | Reason Combinator Instrument Patch |
| cmb | SGI Scalable Graphics Compositor Combination File |
| cmbak | CET Designer Drawing Backup |
| 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 | CIFMIF File |
| 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 | Corel Multimedia Manager v7 Album |
| cmmtheme | CleanMyMac Theme Data |
| cmn | Microsoft SMS Collection Membership Update |
| cmo | 3DVIA Virtools Behavioral Server Composition |
