| 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 | Certificate Trust List |
| ctl | dBase IV Aldus Setup Control Data |
| ctl | EAGLE Autorouter Control Data |
| ctl | EditPlus Cliptext Data |
| ctl | LabVIEW Control Data |
| ctl | Lotus Notes 5 Thesaurus Data |
| ctl | RSView Machine Edition Control Data |
| ctlg | elcoCAD Catalog Data |
| ctlx | myCatalogs Database |
| ctm | CrazyTalk Model Data |
| ctm | OpenCTM Compressed Triangle Mesh Format Data |
| ctmdpi | MRMC Rate Matrix Data |
| ctn | CADTERNS Sloper |
| ctoa | MediaForge Runtime Data |
| ctp | Creatacard Data |
| ctpx | Microvellum Cut Parts File |
| ctr | BrainVoyager QX Contrast Data |
| ctr | CTRAN/W Define Format Data |
| cts | CrazyTalk Script |
| cts | GodswMobile Contacts Transfer Backup |
| ctt | ETCBC Coded Text Tabulated Data |
| ctt | LabVIEW Control Template |
| ctt | MSN Messenger Contact List |
| ctx | Cherrytree Password Protected SQLite Database |
| ctx | CTRAN/W Compressed Define Format Data |
| ctx | CyberTracker Exported Data |
| ctx | Forio Epicenter Model Context Data |
| ctx | Nokia PC Suite Contacts Backup |
| ctx | Pretty Good Privacy Cipher Text Data |
