| 1. | .ct | Bitmap graphics (32bit CMYK) (Iris CT format) (Iris printers) ◊ Bitmap graphics (32bit CMYK) (Scitex CT Bitmap) (Scitex scanners) |
| 2. | .ctc | Control file (PC Installer) |
| 3. | .ctf | Character code translation file (Symphony) |
| 4. | .ctl | Control file (dBASE IV - Aldus Setup) |
| 5. | .ctr | Bitmap graphics (CalComp Thermal Raster file) |
| 6. | .cts | Permanent location contents (ABC programming language) |
| 7. | .ctx | Ciphertext file (Pretty Good Privacy) ◊ Course TeXt file (Microsoft online guides) ◊ User control binary file (Visual Basic) |
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