| fwdn | File Warden Data |
| fwe | FWS Field Data |
| fwf | Bentley InRoads Survey Feature Table Data |
| fwiz | Autodesk Inventor Stress Analysis FWIZ Data |
| fwkey | FlexiWrite Document Lock |
| fwl | FileWrangler Library |
| fwl | Firewall Builder Library |
| fwlic | FlexiWrite License Data |
| fwn | FreeWave Network Data |
| fwp | FLAMES Windows Viewer Project |
| fwr | Faceware Analyzer Tracking Data |
| fws | FileWrangler Data |
| fwt | FTS Network Design Data |
| fx | FastLynx Online Guide |
| fx | ReadyBoot Trace Data |
| fxb | Cubase FX Bank |
| fxf | BigFix Action Data |
| fxf | IBM Endpoint Manager Action |
| fxi | Casio fx-9860G Interface Format Data |
| fxm | BigFix Fixlet Pool Data |
| fxm | messiahStudio Motion Data |
| fxn | Fast XML Notation Data |
| fxp | Bentley InRoads Survey Preferences Data |
| fxp | Cubase FX Program |
| fxr | Oracle Documaker Font Cross-Reference Data |
| fxs | messiahStudio Scene Data |
| fxt | FaceFX Actor Template |
| fxt | MakeMusic Finale Script |
| fxtc | Adobe After Effects FXTC Data |
| fxv | SPSD/M FXV Data |
