| 11. | .ue2 | Encrypted file archive (UltraCompressor II) |
| 12. | .ufa | Compressed file archive (UFA) |
| 13. | .ufo | Ulead File for Objects (Ulead PhotoImpact) |
| 14. | .ug | Drawing file (AutoCAD and others) |
| 15. | .uhs | Universal Hint System (binary file) |
| 16. | .ui | Espire language source code file (Geoworks UI Compiler) ◊ User interface (Sprint) |
| 17. | .uif | Long prompts for windows (WordPerfect) |
| 18. | .uih | Espire header file (Geoworks UI Compiler) |
| 19. | .uil | Bitmap graphics (Motif UIL icon file) |
| 20. | .ul | Sound (Raw CCITT/ITU G.711 mu-law format data) |
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