| fres | Autodesk Inventor Stress Analysis Results Data |
| frf | Abbyy FineReader Intenal Page Data |
| fri | Fractal Explorer IFS Spot |
| frk | FORMIK Data |
| frm | EZ-Forms Master Form |
| frm | FractInt Fractal Formula Data |
| frmx | AccountRight Custom Form Data |
| fro | dBASE IV Compiled Report |
| fro | Fractal Explorer Orbita Spot |
| frp | Fractal Explorer Palette |
| frq | Lucene Frequencies File |
| frq | PLINK Basic Allele Frequency Report |
| frqx | PLINK Genotype Count Report |
| frs | FME Feature Store Raster Sidecar File |
| frs | Fractal Explorer Spot |
| fru | FreeIPMI FRU Data |
| frv | Microsoft FRx DrillDown Viewer File |
| frz | Microsoft FRx DrillDown Viewer Compressed File |
| frz | Snes9x Saved State |
| fs | Edinburgh Instruments FLS1000 Data |
| fs | RMCProfile Sulphur and Fluorine Data |
| fsa | ABI Fragment Analysis Data |
| fsac | File Search Assistant Data |
| fsat | Autodesk Inventor Stress Analysis FSAT Data |
| fsc | FLAMES Scenario Data |
| fsd | FacetWin File Set Description |
| fsd | Microsoft Office File Cache |
| fsdb | Novas Software Waveform File |
| fse | Altair FEKO SPARK3D Export Data |
| fse | Epson Projector Scenario Data |
