| car | BREW MP Component Application Resource |
| catscript | CATIA Script |
| catvbs | CATIA VB Script |
| cax | Amazon Lumberyard CAD Exchange Data |
| cb | BRIEF Macro File |
| cbk | Delphi Temporary Backup |
| cbl | COBOL Source Code |
| cbo | COMBAS Binbary Object |
| cbs | Cardbox Macro Script |
| cbxml | CodeBox Library |
| cc | C++ Source Code |
| ccb | CopperCube Scene File |
| ccb | Visual Basic Animated Button Configuration |
| ccbi | CocosBuilder Export File |
| ccbjs | CopperCube JavaScript File |
| ccg | GNOME C++ Source Code |
| ccn | Multimedia Fusion Compressed Data |
| cco | CodeCheck Object File |
| ccp | CodeCharge Studio Page |
| ccproj | Microsoft Azure Project |
| ccscc | ClearCase Source Control Info |
| ccx | Click and Create Extension |
| ccxml | CCXML Document |
| ccxml | TI Code Composer Studio Target Configuration |
| cdb | µVision Device Database |
| cdf | Amazon Lumberyard Character Definition Data |
| cdml | Claris Dynamic Markup Language Document |
| cdt | ProWorx NXT Temporary Long Comment Data |
| cdx | Alpha Five Table Index |
| cec | Windows CE Catalog Item |
| cel | CIMFast Event Language Source Code |
| cem | Windows CE Emulator Image |
| cesf | Ultra TC Editors Script |
| cet | Hitachi COBOL2002 Data |
| cetool | Windows CE Plugin |
