| 271. | .csm | Chemical Style Markup Language ◊ Precompiled headers (Borland C++) ◊ Script file (Kodak Dc265 Camera) |
| 272. | .csml | Chemical Style Markup Language |
| 273. | .cso | Customer service data and outcome file |
| 274. | .csp | Document (CommonSpace) ◊ Screen Image (PC Emcee) |
| 275. | .cst | Cast (resource) file (Macromedia Director) ◊ Template (CommonSpace) |
| 276. | .csv | Adjusted EGA/VGA palette (CompuShow) ◊ Data file (Comma Separated Values format) |
| 277. | .csy | Polymorphic DLL (EPOC) |
| 278. | CSS | Cascade Style Sheet See also: Cascade Style Sheet |
| 279. | .ct | Bitmap graphics (32bit CMYK) (Iris CT format) (Iris printers) ◊ Bitmap graphics (32bit CMYK) (Scitex CT Bitmap) (Scitex scanners) |
| 280. | .ctc | Control file (PC Installer) |
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