| Abbreviation | Definition |
|---|---|
| FIO | Graphics filter (Aldus PhotoStyler) |
| FIT | File Index Table ( Windows NT) |
| FIT | Flexible Image Transport System Graphics and data |
| FITS | Flexible Image Transport System Graphics and data |
| FIX | Patch file |
| FKY | Macro file (FoxPro) |
| FL | Sound (Floating format) (hardware dependant not transportable) |
| FLB | Format library (Papyrus) |
| FLC | Animation (AutoDesk FLIC format) (Autodesk Animator) |
| FLD | Folder (Charisma) |
| FLF | FLAMES license file, Enterprise Edition |
| FLI | AutoDesk FLIC format Animation file |
| FLI | Tex font library (EmTeX) |
| FLK | File Lock (FuJe Software) |
| FLM | Film Roll (AutoCAD/AutoShade) |
| FLT | Asymetrix ToolBook Graphics FiLTer file |
| FLT | Micrografx Picture Publisher Data FlLTer file |
| FLT | MultiGen FLighT file |
| FLV | Flash Video |
| FLX | Animation format |