| fde | AFP Form Definition |
| fde | FLAMES Dataset Export Data |
| fdf | Format Description File |
| fdf | Origin Fitting Function Definition File |
| fdff | Fast Duplicate File Finder Data |
| fdk | Fluentizer Dictionary Data |
| fdlang2 | FeedDemon Language Data |
| fdlang4 | FeedDemon Language Data |
| fdm | SIPINA FDM Data |
| fdn | MODFLOW Drawdown Data |
| fdo | ModelSim Script |
| fdp | Epson PhotoQuicker Frame |
| fdp | Viamichelin Map File |
| fdpart | Fresh Download Partial Downloaded File |
| fdrp | Mac OS X Folder Alias Data |
| fdsrch2 | FeedDemon Search Data |
| fdt | Lucene Field Data |
| fdt | Visilogic Utilities Full Data Table |
| fdx | Food Data Exchange File |
| fdx | Lucene Field Index |
| fdxsl2 | FeedDemon Newspaper Style |
| fdxsl4 | FeedDemon Newspaper Style |
| fe | Surface Evolver Data File |
| feap | Enterprise Architect Repository |
| feat | Feature Chemical Modeller Output Data |
| feb | Corel WordPerfect FE Buttons Data |
| feb | Sybase PowerDesigner Free Model Backup |
| fedb | ANSYS Workbench FE Modeler Data |
| fee | Precision Fees Data |
| feed | JRiver Media Center Feed Data |
| feed-ms | Microsoft RSS Feed Store |
| feedback | Microsoft Expression SketchFlow Feedback Data |
| fef | Steuer 2001 FEF Data |
| fek | Altair FEKO Input Data |
| fel | Fugawi Elevation Library Data |
