| esi | EtherCAT Slave Information File |
| esy | EmEditor Syntax file |
| evp | EarthView Settings |
| ewc | EWView for DOS Configuration |
| exe4j | Exe4j Configuration |
| exportedui | Microsoft Office Exported UI Customization |
| exrc | EX Configuration |
| ext | WinBatch Studio Extender Settings |
| ezhex | Logitech Harmony Saved Configuration |
| fboptsx | FileBoss Settings Data |
| fbt | Abbyy FineReader Document Options File |
| fcfg | Fedora Server Configuration Data |
| fcu | Totalflow PCCU32 Configuration |
| fdoc | Microsoft XPS Document Settings |
| feq | Foobar2000 Equalizer Preset |
| ffpreset | FFmpeg Presets Data |
| ffs_batch | FreeFileSync Batch Configuration |
| ffs_gui | FreeFileSync Configuration Data |
| ffs_real | FreeFileSync RealTimeSync Configuration |
| fiv | CruiseComp Forest Inventory Settings |
| fld | Microsoft SharePoint Federated Location Definition |
| flst | Adobe InDesign Flattener Settings |
| flx | The Bat! Folder Settings |
| fmcf | Adobe Type Manager Preferences Data |
| fni | ALCUGS Settings |
| fnp | IBM FileNet IDM Desktop Configuration File |
| fpw | Microsoft Visual FoxPro Configuration |
| frc | Mandelbrot Explorer Color Settings |
| frr | Mandelbrot Explorer Fractal Region Settings |
| fsi | FSI Viewer Configuration |
| fsk | FotoSketcher Parameter Preset |
| fstab | Linux Filesystems Information Table |
| ftp | General FTP Profile Data |
| ftpc | EBooksWriter FTP Settings |
| fwk | FacetWin User Keyboard Mapping |