| File extension Name |
extension description |
| .6 | Salt Lake City Game Music File |
| .6 | Screen Log File |
| .6 | IBM Voice Type Language Script Data File |
| .6 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .60 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .601 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .602 | T602 Text File |
| .60D | CCTV Data File |
| .60D | Vista Columbus Digital CCTV System Recording |
| .60H | Vista Columbus Digital CCTV System Recording |
| .61 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .62 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .64 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .640 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .64B | C64 PC64 Emulator File |
| .64C | C64 PC64 Emulator File |
| .64D | C64 PC64 Emulator File |
| .64K | C64 PC64 Emulator File |
| .660 | FLEXnet Manager (Acresso Software Inc.) |
| .668 | Music File |
| .669 | 669 Tracker Module |
| .669 | Unis Composer Music File |
| .67C | FLEXnet Manager (Acresso Software Inc.) |
| .68 | PC Curses 14 File |
| .682 | Trend Pc-cillin 2000 File |
| .686 | Asm686 |
| .699 | Portable 699 Loader v0.2 |
| .6AM | Haltech ECU Fuel and Ignition Map |
| .6CM | Triton FastTracker 6-Channel Music |
| .6CM | Sound; 669 Composer |
| .6DK | OS/2 Saved SKF Format File (IBM) |