| c4 | Edmics Image |
| ca1 | Atari ST CrackArt Image |
| ca2 | Atari ST CrackArt Image |
| ca3 | Atari ST CrackArt Image |
| cal | CALS Compressed Bitmap |
| cals | CALS Compressed Bitmap |
| cam | Casio QV-10 Digital Camera Image |
| can | Canon Navigator Fax |
| cbm | Color FBM Image |
| cbn | CBN Selector Smart Image |
| ccf | ArcSoft Collage Creator File |
| cci | Champions Interlace Compressed Image |
| cdr | CorelDraw Drawing |
| cdrzip | DICOM Zipped Images Archive |
| cdt | CorelDraw Template |
| cdu | CDU Paint Image |
| cdx | CorelDraw Compressed Drawing |
| ce | ComputerEyes Raw Image |
| ce1 | ComputerEyes Raw Image |
| ce2 | ComputerEyes Raw Image |
| ceg | Continuous Edge Graphic Bitmap |
| cel | Lumena Cell Information |
| cel | Atari ST Cyber Paint Cell Image |
| cel | Kisekae Set System CEL File |
| cg4 | CALS Group 4 Bitmap |
| cgm | Computer Graphics Metafile |
| ch | Scitex Continuous Tone |
| che | Commodore 64 Cheese Image |
| ciff | Canon Raw Image |
| cimg | CImg Image |
| cin | Kodak Cineon Image |
| cin | Atari 8-bit Champions Interlace Image |
| cip | Cisco IP Phone Image |
| cit | Intergraph Format Bitmap Image |
| clip | Clip Studio Format Image |