| 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 |
| frv | Microsoft FRx DrillDown Viewer File |
| frz | Microsoft FRx DrillDown Viewer Compressed File |
| fsa | ABI Fragment Analysis Data |
| fsd | FacetWin File Set Description |
| fsdb | Novas Software Waveform File |
| fsf | FSL Feat Setup Script |
| fsif | MyLabel Designer Deluxe Data |
| fsk | Atari 8-bit Tape Data |
| fso | Adobe Flash Media Server Remote Shared Object |
| fsp | iGO Primo Map File |
| fsqueue | FeedStation Queue Data |
| fss | Splitty Data Split |
| fst | PLINK Fixation Index Report |
| fsz | Fractal Zplot Data |
| ft | EdgeCAM Feature Template |
| fta | OpenFTA File |
| ftf | Xperia X10 Phone FTF Firmware |
| fth | FileMaker Pro Theme |
| ftmb | Family Tree Maker Backup Data |
| ftr | CONDOR Flight Track |
