| 31. | .fbn | spatial index file for read-only datasets (ArcView) |
| 32. | .fbx | spatial index file for read-only datasets (ArcView) |
| 33. | .fc | Spell checking dictionary (Harvard Graphics 2.0) |
| 34. | .fcc | FirstClass Dictionary file |
| 35. | .fcd | Output file (FastCAD/EasyCAD) ◊ Virtual CDROM file |
| 36. | .fcl | Link (CyberAudioLibrary) |
| 37. | .fcm | Binary file patch file (forward compression) (jlpak10.zip) |
| 38. | .fd | Declaration file (Microsoft Fortran) ◊ Field offsets for compiler (DataFlex) ◊ Resource file (Front Door) |
| 39. | .fdb | Database (Navison Ninancials) |
| 40. | .fdf | Forms document (Adobe Acrobat) |
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