| frac | Tinker Fractional Coordinates |
| fract | Free Form Fractional Chemical Data |
| frag | SAM A2M Alignment Data |
| fragment | IBM DB2 Fragment Data |
| fram | Adobe FrameMaker Interchange Format Data |
| frame | Adobe FrameMaker Interchange Format Data |
| frames | xScope Frames File |
| frameset | Frame Painter for LGS Frame Set Data |
| frb | Microsoft FRx DrillDown Viewer Report Book |
| frc | FLAMES Recorder Output Data |
| frd | Frequency Response Data |
| frd | Mandelbrot Explorer Fractal Definition File |
| frd | Microsoft FRx DrillDown Viewer Enhanced XML |
| 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 |
| frf | Abbyy FineReader Intenal Page Data |
| fri | Fractal Explorer IFS Spot |
| frk | FORMIK Data |
| frm | Corel Painter Frame Stack 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 |
