| fpf | IKEA Home Planner Document |
| fpl | FrontDesigner Panel Data |
| fqc | FAQ Creator Document |
| frag | Microsoft XPS Fragment |
| frdoc | Abbyy FineReader Document |
| frl | Accelio FormFlow Document |
| fry | Fryrender Scene |
| frz | Accelio FormFlow Locked Document |
| fs | FlexiSign Document |
| fsc | Practical Scriptwriter Document |
| fsn | Greeting Card Factory Document |
| ftb | Family Tree Maker Document Backup |
| ftf | FORTE Template Document |
| ftg | Windows Help Full Text Group File |
| ftl | Family Tree Legends Document |
| ftm | MakeMusic Finale Template |
| ftmd | Family Tree Maker for Mac v2 Document |
| ftmm | Family Tree Maker for Mac v1 Document |
| ftmt | Family Tree Maker for Mac Chart Template |
| ftmx | MakeMusic Finale Template |
| ftpl | Simfatic Forms Template |
| fts | Windows Help Full-Text Search Index |
| ftw | Family Tree Maker Document |
| ftxt | Cloanto C1-Text Document |
| fvml | FormVista Document |
| fw3 | Framework III File |
| fwk | Colton Fireworkz Document |
| fwrt | FullWrite Document |
| fwtb | Freeway Template Bundle |
| fwtemplate | Freeway Template |
| fwtemplateb | Freeway Template Bundle |
| fx2 | Corel WordPerfect Office Template |
| fxd | FX Draw Document |
| fxd | WinFax Document |
| fxi | WinFax Document |
