| csaplan | SPSS Complex Sample Analysis Plan |
| csb | Corel Binary Script |
| csc | STK Calculation Scalar File |
| csc | CHARTrunner Control Chart Style |
| csc | Corel Script |
| csdate | ClickStamper Date Stamp Data |
| csdf | SPICE Common Simulation Data Format File |
| csdsig | Altaro Oops!Backup Data |
| 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 | ClearSilver Template File |
| csutil | ColorSync Utility Data |
| csvx | uProduce Server CSVX Data |
| csy | ACDSee Canvas Symbol Data |
| ct | Cheat Engine Cheat Table |
| ct3 | Casio WK-1800 User Tones Data |
| ct5 | CaseMap 5 Template |
| cta | ColorTouch Assistant Data |
| ctb | Cherrytree SQLite Database |
| ctbl | Xamine Data |
| ctd | Cherrytree XML Data |
| ctf | ECMG Content Transformation File |
| cti | Collectorz.com Template Info File |
| ctlg | elcoCAD Catalog Data |
| ctmdpi | MRMC Rate Matrix Data |
