| fbk | FlashFXP Backup Data |
| fbk | Microsoft Dynamics NAV Database Backup |
| fbl | CADfix Command Level Log |
| fbl | iGO Map file |
| fbl7 | FinalBuilder v7 Project Log |
| fbl8 | FinalBuilder v8 Project Log |
| fbm | CADfix ASCII Geometry Data |
| fbm | CADfix Command Level Log |
| fbm | CADfix Geometry Database |
| fbmod | Frosty Tool Suite Data |
| fbn | Sony-Ericsson Phone Flash Filesystem |
| fbnd | Mac OS X Communication Tool Data |
| fbopts | FileBoss Options Data |
| fbr | Avantes Avasoft v8 Bare Fiber Data |
| fbr | BrainVoyager QX Fiber Coordinates Data |
| fbv | GrafNav Exported Binary Values Data |
| fbwins | FileBoss Internal Data |
| fbwinsx | FileBoss Internal Data |
| fc | Harvard Graphics 2.0 Spellchecking Dictionary |
| fc1 | FCEUX Saved State |
| fc2 | FCEUX Saved State |
| fc2 | Poser Face Data |
| fc3 | FCEUX Saved State |
| fca | Omnis Web Client Form Cache |
| fcat | Fact200 Categories Data |
| fcc | SiteMinder Forms Credential Collector Data |
| fcd | PFS First Choice Database |
| fcdot | ABBYY FlexiCapture Engine Document Definition |
| fcf | XtalView Xfit Phase Data |
| fcg | GAUSS Engine Compiled Gauss Data |
| fch | Gaussian Formatted Checkpoint File |
| fchc | Fetch Cache Data |
| fchk | Gaussian Formatted Checkpoint File |
| fci | Erosion 3D Inflow Table |
| fci | Fiery Clone Tool Image |
