| 1. | .cnc | CNC general program data |
| 2. | .cnf | Configuration (program - printer setup) |
| 3. | .cnm | Windows application menu options and setup file |
| 4. | .cnq | Shop file (Compuworks Design) |
| 5. | .cnt | Contents file (Windows Help) ◊ Contents tab file (Rational Rose 98) |
| 6. | .cnv | Data conversion support file (Word for Windows) ◊ Temporary file (WordPerfect) |
| 7. | CNI | Coalition for Networked Information See also: Coalition for Networked Information |