| 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 |
| cta | ColorTouch Assistant Data |
| ctab | CACTVS Data |
| ctb | Cherrytree SQLite Database |
| ctb | Custody Toolbox Data |
| ctb | NoteTab Clipbar Data |
| 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 |
| ctf | HP 95LX Comm Program Character Translation Data |
| ctf | Lotus Symphony Character Translation Data |
| ctf | PhotoSuite Album Data |
| ctf | PSP Custom Theme |
| ctfsys | Mac OS X Mach Kernel CTFSYS Data |
| ctg | BMC Patrol Catalog Data |
| cth | MegaPOV Cloth Simulation Data |
| cti | Collectorz.com Template Info File |
| ctk | TeKton3D Project Chapter Data |
| ctl | dBase IV Aldus Setup Control Data |
| ctl | EAGLE Autorouter Control Data |
| ctl | EditPlus Cliptext Data |
| ctl | LabVIEW Control Data |
| ctl | RSView Machine Edition Control Data |
| ctlg | elcoCAD Catalog Data |
| ctlx | myCatalogs Database |
