| csm | Mail.dat Container Summary File |
| csmo | Free College Schedule Maker Data |
| csn | Race Studio 2 Custom Sensors Data |
| csom | Qualcomm Eudora for Mac Creator Code Data |
| cson | CoffeeScript Object Notation |
| csp | CHARTrunner Pareto Style |
| cspl | Mozilla Firefox CSPL Data |
| csplan | SPSS Sampling Plan |
| css | Scream Center for Seismic Studies Data |
| css1 | CSS Backup |
| cssr | CSD Crystal Structure Search and Retrieval Data |
| csstore | iOS Cache Data |
| cssx | Now Platform External CSS |
| cst | CHARTrunner Control Chart Style |
| cst | ClearSilver Template File |
| cst | Medbasin Model Calibration Data |
| cst | SAM Constraints Data |
| cst | SWAT Weather Forecast Input Data |
| csup | Clan Short Roster Database |
| csutil | ColorSync Utility Data |
| csview | Chaoscope View Data |
| csvx | uProduce Server CSVX 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 |
| ct4 | CaseMap 4 Template |
| ct4im | CrazyTalk Data |
| ct5 | CaseMap 5 Template |
| ct7 | CaseMap 7 Case Analysis Template |
| ct7model | CrazyTalk Model Data |
