| fc | FirstClass Settings Data |
| fcfg | Fedora Server Configuration Data |
| fchp | Fetch Preferences Data |
| fcp | FirstClass Client Protocol Data |
| fcs | Foobar2000 Columns UI Settings Data |
| fcs | RealProducer Pro Settings Data |
| fcu | Totalflow PCCU32 Configuration |
| fdoc | Microsoft XPS Document Settings |
| feq | Foobar2000 Equalizer Preset |
| ffapreset | ffdshow Audio Preset Data |
| ffpreset | FFmpeg Presets Data |
| ffs_batch | FreeFileSync Batch Configuration |
| ffs_gui | FreeFileSync Configuration Data |
| ffs_real | FreeFileSync RealTimeSync Configuration |
| fgs | Fig Figure Settings Data |
| fiv | CruiseComp Forest Inventory Settings |
| fld | Microsoft SharePoint Federated Location Definition |
| fle | FLE Scanner Settings File |
| flst | Adobe InDesign Flattener Settings |
| flt | 123LogAnalyzer Filter |
| flx | The Bat! Folder Settings |
| fmcf | Adobe Type Manager Preferences Data |
| fni | ALCUGS Settings |
| fnp | IBM FileNet IDM Desktop Configuration File |
| fns | Mac OS FontSyncScripting Font Profile |
| fpw | Microsoft Visual FoxPro Configuration |
| frc | Mandelbrot Explorer Color Settings |
| frr | Mandelbrot Explorer Fractal Region Settings |
| fsdf | Fanuc Open CNC Settings Data |
| fsi | FSI Viewer Configuration |
