| .chart |
Guitar Rhythm Chart File |
| .cbc |
Comic Book Collection |
| .ctc |
Visual Studio Command Table Configuration File |
| .colourscheme |
Speedy Browser Colour Scheme File |
| .cwd |
Nonogram Puzzle File |
| .cphd |
CloudChan Pre-processed Hypertext Document |
| .cmake |
CMake File |
| .civ5sln |
Civilization 5 Solution File |
| .cn1 |
CNR Modem Initialization Data File |
| .chef |
Chef Source Code File |
| .cf |
Sendmail Configuration File |
| .chs |
Windows Chinese Noise-Word List File |
| .craft |
KSP Spacecraft File |
| .controls |
OpenBVE Keyboard Shortcuts File |
| .caction |
Automator Converter Action |
| .cm0013 |
Samsung Smart TV Index File |
| .dat |
Data File |
| .db |
Mobile Device Database File |
| .dxf |
Drawing Exchange Format File |
| .dtd |
Document Type Definition File |
| .dot |
Word Document Template |
| .dwt |
Dreamweaver Web Page Template |
| .dpr |
Delphi Project |
| .dif |
Data Interchange Format |