| csctf | Colasoft Capsa Data |
| csdate | ClickStamper Date Stamp Data |
| csdb | CSPro Database |
| csdf | SPICE Common Simulation Data Format File |
| csdsig | Altaro Oops!Backup Data |
| csf | SmartWare Data Format Definition |
| csfdb | Open CASCADE 3D Model |
| csgen | ClickStamper Data |
| csh | CHARTrunner Histogram Style |
| csj | BlackBerry Code Signing Data |
| csk | BlackBerry Code Signing Keys |
| csm | Mail.dat Container Summary File |
| csn | Race Studio 2 Custom Sensors Data |
| cson | CoffeeScript Object Notation |
| csp | CHARTrunner Pareto Style |
| csplan | SPSS Sampling Plan |
| csstore | iOS Cache Data |
| cssx | Now Platform External CSS |
| cst | CHARTrunner Control Chart Style |
| cst | SAM Constraints Data |
| cst | ClearSilver Template File |
| csup | Clan Short Roster Database |
| csutil | ColorSync Utility Data |
| csvx | uProduce Server CSVX Data |
| csy | ACDSee Canvas Symbol Data |
| ct | Cheat Engine Cheat Table |
| ct2 | C-Trend II Data |
| ct3 | Casio WK-1800 User Tones Data |
| ct4 | CaseMap 4 Template |
| ct4im | CrazyTalk Data |
| ct5 | CaseMap 5 Template |
| ct7 | CaseMap 7 Case Analysis Template |
| ct7model | CrazyTalk Model Data |
| ct7script | CrazyTalk Script |
| ct8 | CaseMap 8 Template |