| 41. | .cbi | Column binary formatted file (IBM mainframe systems) |
| 42. | .cbl | Cobol language source code file |
| 43. | .cbm | Compiled bitmap graphics (XLib) |
| 44. | .cbs | Button bar configuration file (MasterWord) |
| 45. | .cbt | Tutorial (Computer Based Training) |
| 46. | .cc | C++ language source code file (gcc) ◊ CC language source code file (cc) ◊ Custom class (Visual dBASE) |
| 47. | .cca | Mail archive (cc:Mail) |
| 48. | .ccad | Data (ClarisCAD) |
| 49. | .ccb | Animated Button configuration (Visual Basic) |
| 50. | .ccc | Bitmap graphics (Curtain Call native format) ◊ Conversation (Microsoft Chat) |
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