| 1. | .fo1 | Font file (Borland Turbo C) |
| 2. | .fo2 | Font file (Borland Turbo C) |
| 3. | .fog | Fontographer Database File (Fontographer) |
| 4. | .fol | Saved message folder (1st Reader) |
| 5. | .fon | Bitmap font file (many - Windows 3.x font library) ◊ Call log (Procomm Plus) ◊ Phonebook (Terminate - Terminator - Telix) |
| 6. | .font | Font data (unix) |
| 7. | .fop | Raster graphics (Freedom of Press) |
| 8. | .for | Form (WindowBase) ◊ Fortran language source code file (fixed form) |
| 9. | .fot | Installed TrueType font styles |
| 10. | .fox | Foxbase executable (precompiled .prg) (FoxBase) |
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