| csutil | ColorSync Utility Data |
| csvenx | Egis Encrypted CSV Document |
| csview | Chaoscope View Data |
| csvx | uProduce Server CSVX Data |
| csw | Corel WordPerfect Setup Information Data |
| csy | ACDSee Canvas Symbol Data |
| ct | Cheat Engine Cheat Table |
| ct | ETCBC Chapter Data |
| ct0 | Tajima DG/ML TBF Condition Data |
| ct1 | Microsoft SMS Proposed Site Control Data |
| ct2 | C-Trend II Data |
| ct3 | CaseMap 3 Case Analysis Template |
| ct3 | Casio WK-1800 User Tones Data |
| ct3 | Microsoft SMS Control Data |
| ct4 | CaseMap 4 Template |
| ct4im | CrazyTalk Data |
| ct5 | CaseMap 5 Template |
| ct6 | CaseMap 6 Template |
| ct7 | CaseMap 7 Case Analysis Template |
| ct7model | CrazyTalk Model Data |
| ct7script | CrazyTalk Script |
| ct8 | CaseMap 8 Template |
| cta | ColorTouch Assistant Data |
| ctab | CACTVS Data |
| ctb | Cherrytree SQLite Database |
| ctb | Custody Toolbox Data |
| ctb | NoteTab Clipbar Data |
| ctbl | 3D Slicer Color Table |
| ctbl | Xamine Data |
| ctbodyfitting | CrazyTalk Animator Actor Fitting Data |
| ctd | Cherrytree XML Data |
| ctde | Sony Click to Disc Data |
| ctf | ARCserve Backup Data |
| ctf | CoffeeCup HTML Editor Table Data |
| ctf | ECMG Content Transformation File |
