| List of file extensions begins with U |
You can choose one of the following extensions which begin with the letter 'U':
| Extension | Popularity |
|---|---|
| .u3d | Low |
| .u8 | Low |
| .uae | Low |
| .uax | Low |
| .ubox | Low |
| .ucb | Low |
| .uccapilog | Low |
| .ucf | Low |
| .ud | Low |
| .udc | Medium |
| .udf | Medium |
| .udi | Low |
| .udl | Very High |
| .udp | Low |
| .udt | Low |
| .uenc | Low |
| .ues | Low |
| .uew | Low |
| .uf | Low |
| .uff | Low |
| .ufo | Low |
| .ufp | Low |
| .ufraw | Low |
| .uga | Low |
| .uha | Very High |
| .ui | High |
| .uif | Medium |
| .uim | Low |
| .uin | Low |
| .uip | Low |
| .uis | Low |
| .ukr | Low |
| .ul | Low |
| .uls | Very High |
| .ult | Very High |
| .ulw | Low |
| .ulx | Low |
| .ulz | Low |
| .um3 | Low |
| .umc | Low |
| .umod | Low |
| .ump | Low |
| .umprofile | Low |
| .ums | Low |
| .umshortcut | Low |
| .umx | Low |
| .und | Low |
| .unf | Low |
| .uni | Low |
| .unr | Low |
| .unreal | Low |
| .unt | Low |
| .upd | Low |
| .upj | Low |
| .upm | Low |
| .upr | Low |
| .urd | Low |
| .url | Very High |
| .urls | Low |
| .urt | Low |
| .usa | Low |
| .usecasediagram | Low |
| .user | Very High |
| .userprofile | Low |
| .uservar | Low |
| .usf | Low |
| .ush | Low |
| .usl | Low |
| .usp | Low |
| .usr | Low |
| .uss | Low |
| .usz | Low |
| .ut2 | Low |
| .ut2link | Low |
| .ut4mod | Low |
| .uti | Very High |
| .utl | Low |
| .uts | Very High |
| .utx | Low |
| .uu | Very High |
| .uue | Very High |
| .uvr | Low |
| .uwl | Low |
| .uxdc | Very High |
| .uxr | Low |
| .uyvy | Low |
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