| cod | Forte Agent Character Map |
| cod | MODELLER Sequence Codes List |
| cod | StatPac Gold Data |
| cod | SWAT Input Control Data |
| cod | WindLDR Binary PLC Data |
| codec | Rockbox Codec |
| coe | Xilinx CORE Generator Coefficients |
| cof | LightCycler v4 Coefficient Data |
| cog | SolidWorks Enterprise PDM Copied Log |
| cojt | Tecnomatix Kinematics Data |
| cok | TSP-INet Server Error Reports Data |
| col | BibExcel COL Data |
| col | Capture One Session Data |
| col | Internet Color Wizard Color Scheme |
| col | Kogeo Colorbar Data |
| col | Lotus Notes Import Column Description Data |
| col | SequoiaView Color Template |
| collab | Blackboard Collaborate Session Data |
| collection | Adobe Bridge Collection Data |
| color | FontTwister Color Gradient Data |
| color | Ribbons Color Mapping |
| colors | SAM Makelogo Colors Data |
| colors | Scratch v2 Custom Editor Colors Data |
| comicstl | Comic Life 2 StyleSheet Data |
| comment | Geomview Comment Object Data |
| common | MATLAB Install Data |
| comparison7 | Araxis Merge Comparison Data |
| complete | SendSafe Deciphered E-message Data |
| compo | DAZ 3D Carrara Pro Temporary Data |
| con | Acharya Consonant Data |
| con | ALEID2000 Contour Data |
| con | BI/Query Connection File |
| con | Cimagraphi Trace Data |
| con | Corel WordPerfect Concordance Data |
| con | KJT-200 Constituent Data |
