| flo | WRAP Inflow IN Records Data |
| float | ARIA Server Float Data |
| floor | Structural Concrete Software Floor Data |
| flow | Microsoft Expression SketchFlow Data |
| flowmaplibrary | Corel Painter Flowmap Library |
| flp | ActivInspire Flipchart |
| flp | FlipAlbum Data |
| flp | Fractal Explorer Landscape Project |
| flr | WinFlash Results File |
| fls | Creator Fault List File |
| fls | Stock Prospector Exported Data |
| fls | WinFlash Flashcard Source |
| flt | Carlson 2016 Triangulated Irregular Network Data |
| flt | Micrografx Picture Publisher Filter |
| flt | Microsoft Word Input Filter |
| flt | Miles Sound System Flat Data |
| flt | OpenFlight Model Data |
| flt | OpenOffice.org Filter Data |
| flt | OS/2 Warp Filter Device Driver |
| flt | Vue Filter Data |
| flt | WinFlash Compiled Test |
| flt | XMap Flight Plan Data |
| fltr | XTND Filter |
| flu | WinFlash Flashcard Source (new) |
| flw | Fluke LinkWare Database |
| flwa | Folder Lock Wallet File |
| flx | DataFlex Compiled Binary |
| flx | Flexstor Database |
| flx | MODTRAN FLX Output File |
| flxdato | OnScale Binary Results Data |
| flxext | OnScale Extrapolation Data |
| flxffl | OnScale Free Field Data |
| flxhst | OnScale Binary History Data |
| flxinp | OnScale Job Input Data |
| flxmdl | OnScale Binary Model Data |
