| cmj | ControlMyJoystick Profile |
| cml | Chemical Markup Language File |
| cml | CryptoMailer Encrypted File |
| 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 |
| cmo3 | Live2D Cubism 3 Model Data |
| cmod | Celestia Model |
| cmp | KiCad Parts-to-module Assignments Data |
| cmp | General CADD Component Data |
| cmp | Heliosoft Seismaster Colormap File |
| cmp7 | Araxis Merge Saved Comparison Data |
| cmp7 | Araxis Merge Comparison Data |
| cmpck | CET Designer Pack and Go Data |
| cmpd | Chemnum Compounds Data |
| cmphs | CET Designer Photo Series Data |
| cmplib | Altium Designer Component Library |
| cmpm | NucleoView Plot Manager Data |
| cmpp | NucleoView Post Processing Data |
| cmppr | CET Designer Paper View Papers Data |
| cmpreset | CET Designer Photograph Setup Preset Data |
| cmpri | CET Designer Project Info |
| cmpt | Cesium Composite Tile Data |
| cmr | Coach Results File |
| cmrbk | CaseMap ReportBook Definition Data |
| cmrcf | CET Designer Reconfig Data |
| cmrf | CET Designer Families Data |
| cmrt | Conflict Minerals Reporting Template |
