| 151. | .fts | Flexible Image Transport System (astronomical data) ◊ Full text search index (Microsoft Windows Help) ◊ UNIX help supporting file (ArcView) |
| 152. | .ftw | Document file (Family Tree Maker) |
| 153. | .fw | Database (FrameWork) |
| 154. | .fw2 | Database (Framework II) |
| 155. | .fw3 | Database (Framework III) |
| 156. | .fw4 | Database (Framework IV) |
| 157. | .fwb | Data file backup for file splitting configuration (FileWrangler) |
| 158. | .fweb | Fortran WEB |
| 159. | .fwk | Database (FrameWork) |
| 160. | .fws | Data file for file splitting configuration (FileWrangler) |
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