| fdml | Filemaker Dynamic Markup Language Document |
| fdt | FlashDevelop Template |
| fdz | FlashDevelop Zip File |
| feature | SharePoint Feature Data |
| fev | FMOD Audio Events |
| fex | WebFOCUS Procedure File |
| ffe | Microsoft DirectInput Force Feedback Effect |
| fgd | Valve Hammer Forge Game Data |
| fgl | FGL Source Code |
| fi | Fortran Interface File |
| fi | Gforth Image File |
| fic | WinDev HyperFileSQL Database |
| fig | MATLAB Figure |
| fil | ProWorx NXT Format Export |
| filters | Visual C++ Project Filters |
| fimpp | FiM++ Source Code |
| fky | Microsoft Visual FoxPro Macro File |
| fla | Shockwave Flash Source File |
| flash | Shockwave Flash Source File |
| flb | EasyBuilder Pro Picture Library |
| flbx | EasyBuilder Pro Picture Library |
| fll | Visual FoxPro DLL |
| flm | Flasm Disassembled SWF |
| fly | Fly Script |
| fmb | Oracle Forms Form Module Binary |
| fmo | dBASE IV Compiled Object |
| fmt | Oracle Forms Form Module Text |
| fmx | Oracle Forms Form Module Executable |
| fn | GCL Cross Referencing Data |
| fo1 | Borland Turbo C Font Data |
