| frc | FLAMES Recorder Output Data |
| Goldmine Report Writer Report |
| XenoView Force Field Data |
| frd | Autodesk Simulation Mechanical DDAM Frequency Data |
| Frequency Response Data |
| Mandelbrot Explorer Fractal Definition File |
| Microsoft FRx DrillDown Viewer Enhanced XML |
| Room EQ Wizard Frequency Response Data |
| frdat | Abbyy FineReader Data |
| frec | Fiasco Database Frequencies File |
| fred | Flight Recorder Electronic Documentation Data |
| freepp | Free PDF Perfect Data |
| freq | SAM Frequency Model Data |
| fres | Autodesk Inventor Stress Analysis Results Data |
| freshcontact | Navigon Mobile Navigator Contact Data |
| frf | Abbyy FineReader Internal Page Data |
| Ginga X-Ray First Reduction Data |
| fri | Fractal Explorer IFS Spot |
| Mozilla Firefox Bookmark Backup Data |
| frk | FORMIK Data |
| frm | AccountEdge Form Data |
| Corel Painter Frame Stack Data |
| EZ-Forms Master Form |
| FractInt Fractal Formula Data |
| MySQL Server Database Format Data |
| PTC Creo Drawing Format Data |
| frmx | AccountRight Custom Form Data |
| fro | dBASE IV Compiled Report |
| Fractal Explorer Orbita Spot |
| froi | First Response of Injury Data |
| frp | Fractal Explorer Palette |
| JetForm FormFlow 2 Form Data |
| frq | BibExcel FRQ Data |
| Lucene Frequencies File |
| PLINK Basic Allele Frequency Report |
| frqx | PLINK Genotype Count Report |
| frs | FME Feature Store Raster Sidecar File |
| Fractal Explorer Spot |
| fru | FreeIPMI FRU Data |
| frv | Microsoft FRx DrillDown Viewer File |
| frz | Microsoft FRx DrillDown Viewer Compressed File |
| Snes9x Saved State |
| fs | Edinburgh Instruments FLS1000 Data |
| FormSaver Data |
| RMCProfile Sulphur and Fluorine Data |
| fsa | ABI Fragment Analysis Data |
| fsac | File Search Assistant Data |
| fsat | Autodesk Inventor Stress Analysis FSAT Data |
| fsc | Campaign Cartographer Catalog Data |
| DesignPro Tools Form Data |
| FLAMES Scenario Data |
| fsd | FacetWin File Set Description |
| fsdb | Novas Software Waveform File |
| fse | Altair FEKO SPARK3D Export Data |
| Epson Projector Scenario Data |
| fset | ARToolKit NFT Feature Set Data |
| Fact200 Results Data |
| fset2 | ARToolKit NFT Feature Set Data |
| fset3 | ARToolKit NFT Feature Set Data |
| fseventsd | Mac OS X FSEvents Data |
| fsf | FSL Feat Setup Script |
| fsfix | F-Secure Internet Security Signed Product Patch |
| fsi | FileSplit Data |
| FME Feature Store Spatial Index Data |
| fsif | MyLabel Designer Deluxe Data |
| fsk | Atari 8-bit Tape Data |
| fskey | F-Secure Internet Security Product Key |
| fsl | Corel Paradox Compiled Form |
| fsm | Splitty Master Split Data |
| fso | Adobe Flash Media Server Remote Shared Object |
| fsp | FormScape Branch Data |
| Fsplit Split Data |
| iGO Primo Map File |
| fsqueue | FeedStation Queue Data |
| fsrc | Fact200 Source Code |
| fss | File Split Pro Data |
| Micrografx Picture Publisher Registration Data |
| PaperPort Slideshow Data |
| Splitty Data Split |
| fssx | FolderSizes Snapshot Data |
