| fra | Adobe Acrobat Reader French Language Data |
| frac | Tinker Fractional Coordinates |
| frag | SAM A2M Alignment Data |
| frames | xScope Frames File |
| frb | Microsoft FRx DrillDown Viewer Report Book |
| frd | Mandelbrot Explorer Fractal Definition File |
| frd | Microsoft FRx DrillDown Viewer Enhanced XML |
| frd | Frequency Response Data |
| frdat | Abbyy FineReader Data |
| frec | Fiasco Database Frequencies File |
| fred | Flight Recorder Electronic Documentation Data |
| freq | SAM Frequency Model Data |
| 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 |
| 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 | Fractal Explorer Spot |
| fru | FreeIPMI FRU Data |
| frv | Microsoft FRx DrillDown Viewer File |
| frz | Microsoft FRx DrillDown Viewer Compressed File |
| fsa | ABI Fragment Analysis Data |
| fsat | Autodesk Inventor Stress Analysis FSAT Data |
| fsd | FacetWin File Set Description |
| fsdb | Novas Software Waveform File |
| fse | Epson Projector Scenario Data |
| fset | Fact200 Results Data |
| fsf | FSL Feat Setup Script |
| fsif | MyLabel Designer Deluxe Data |