| 31. | .upd | Universal print driver (cross-platform print driver) ◊ Update info |
| 32. | .upf | Bitmap graphics (Universal Picture Format) |
| 33. | .upi | Program file (ULead Photo Impact) |
| 34. | .upo | Compiled update data (dBASE) |
| 35. | .upr | User dictionary (Claris) |
| 36. | .upx | Saved Image file (ULead Photo Express) |
| 37. | .urf | Universal radar format (Radar ViewPoint) |
| 38. | .uri | List of Uniform Resource Identifiers (WWW) |
| 39. | .uris | List of Uniform Resource Identifiers (WWW) |
| 40. | .url | Internet shortcut (Universal Resource Locator) |
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