| 1. | .cub | Gaussian Cube (Wavefunction) format |
| 2. | .cube | Bitmap graphics (Cubicomp/Vertigo image file) (Cubicomp PictureMaker) |
| 3. | .cubi | Bitmap graphics (Cubicomp/Vertigo image file) (Cubicomp PictureMaker) |
| 4. | .cue | Microsoft Cue Cards data |
| 5. | .cuf | C Utilities Form definition (Turbo C Utilities) |
| 6. | .cul | Cursor library file (IconForge) |
| 7. | .cur | Cursor image resource (Resource Workshop - Watcom Resource Editor) |
| 8. | .curl | URL links (Curl) |
| 9. | .cursor | Cursor (Sun Cursor file) |
| 10. | .cut | Bitmap graphics (Media Cybernetic's Dr.Halo CUT graphics format) |
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