| 1. | .fi | File Interface (Microsoft Fortran) |
| 2. | .fif | Graphics (Fractal Image Format) |
| 3. | .fig | Graphics (TransFig image format, REND386/AVRIL) ◊ Linker options (Lahey Fortran) |
| 4. | .fil | File listing ◊ File template (Application Generator) ◊ Files list object file (dBASE Application Generator) ◊ Overlay (WordPerfect) |
| 5. | .fin | Print-formatted text file (Perfect Writer - Scribble - MINCE) |
| 6. | .fio | Graphics filter (Aldus PhotoStyler) |
| 7. | .fit | Flexible Image Transport System (astronomical data) ◊ File Index Table (Windows NT) |
| 8. | .fits | Flexible Image Transport System (astronomical data) |
| 9. | .fix | Patch file |
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