| .cxf |
Picasa Collage File |
| .ctxt |
BlueJ Context File |
| .cif |
Easy CD Creator Disk Image |
| .calca |
Calca Document |
| .comp |
Fusion Composition File |
| .cube |
Gaussian Cube File |
| .course |
Super Mario ReMaker Course File |
| .cht |
Emulator Cheat File |
| .cxt |
CX-Programmer Project Text File |
| .cl2 |
HY-TEK Meet Results File |
| .cfml |
ColdFusion Markup Language File |
| .cus |
AutoCAD Custom Dictionary File |
| .crs |
StepMania Course File |
| .cptl |
Adobe Captivate Project Template File |
| .cdmp |
WCS Device Model Profile |
| .c4k |
Clonk Key File |
| .ci |
Windows Content Indexer Catalog File |
| .cyberducklicense |
Cyberduck Donation Key |
| .cpb |
Comicino Studio Project File |
| .cns |
M.U.G.E.N. Character States File |
| .cpq |
Compaq OEM Disc Configuration File |
| .cl2lyt |
Comic Life 2 Layout File |
| .caa |
Chinese Academic Article Link File |
| .coffee |
CoffeeScript JavaScript File |