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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .FBS | Interscape | Data Files | Fastbid Plan Sheet | Fastbid | Interscape |
| .FCB | Interscape | Data Files | FAAST Builder Data | FAAST Builder | Interscape |
| .FCS | Interscape | Data Files | Flow Cytometry Standard File | Verity Software House V-Comp | Interscape |
| .FD | Data Access Worldwide | Data Files | DataFlex Data File | LaTeX Editor | Interscape |
| .FDA | Relic Entertainment | Audio Files | Dawn Of War Audio File | FF&EZ | Interscape |
| .FDD | Parallels | Disk Image Files | Parallels Desktop Floppy Disk Image File | FormDocs | Interscape |
| .FDI | Open Source | Disk Image Files | Floppy Disk Image Files | WinUAE | Interscape |
| .FDK | Interscape | Data Files | Fluentizer Fluent Dictionary | Fluentizer | Interscape |
| .FDT | Final Draft | Text Files | Final Draft 5-7 Template | FormDocs | Interscape |
| .FF2 | AceBIT | Data Files | Hello Engines! | Hello Engines | Interscape |
| .FFF | Hasselblad | Camera Raw Files | Hasselblad RAW Image | MAGGI | Interscape |
| .FIN | Interscape | Text Files | Sapir Torah Text | Sapir Torah | Interscape |
| .FLAG | Interscape | Graphic Files | FlagMaker Document | FlagMaker | Interscape |
| .FLEX | Unknown Developer | Data Files | Flexi Data Smoothing File | Flexi Smoothing Data | Interscape |
| .FLUX | Interscape | Video Files | FluxTime Studio Clip | FluxTime Studio | Interscape |
| .FMC | Interscape | Data Files | FormConnect Form File | FormConnect | Interscape |
| .FMP | Dreamingsoft | Web Files | 123 Flash Menu Project | Profit Plan | Interscape |
| .FNO | Folio Corporation | Data Files | Folio Infobase File | Atlast File Notes Organizer | Interscape |
| .FPG | The Game Creators | Game Files | FPS Creator Game Project File | FlameBird | Interscape |
| .FPK | Interscape | Game Files | Civilization 4 Data File | Take-Two Interactive Civilization 3 | Interscape |
| .FRD | Interscape | Data Files | Frequency Response Data File | SPL Tracer | Interscape |
| .FSP | Wondershare Software Co., Ltd. | Data Files | Flash Slideshow Builder Project | Fsplit | Interscape |
| .FUD | Interscape | Data Files | FairUse Wizard Data File | FairUse Wizard | Interscape |
| .FUP | Interscape | Data Files | FairUse Project File | FairUse Wizard | Interscape |
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