| 1. | .$1 | ZX Spectrum file in HOBETA format |
| 2. | .1 | Unformatted manual page (Roff/nroff/troff/groff) |
| 3. | .10x | Bitmap graphics (Gemini 10x printer graphics file) |
| 4. | .113 | Backup data file (Iomega Backup) |
| 5. | .123 | Data (Lotus 1-2-3) |
| 6. | .12m | Smartmaster file (Lotus 1-2-3) |
| 7. | .12u | Printer font with PI font set (DOS PageMaker) |
| 8. | .15u | Printer font with PI font set (DOS PageMaker) |
| 9. | .1-step | Backup file (Iomega Backup) |
| 10. | .1st | Usually README.1ST text |
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