List of filename extensions / U
This list contains common file name extensions that are used in some operating systems to differentiate between file formats . In other operating systems, file type identification is mainly carried out using the file header, and the MIME type is more important than the file name extension for e-mail attachments . Systems that use the latter two approaches usually ignore the extension completely.
| Filename extension | MIME type | Full name | Remarks, usage |
|---|---|---|---|
| .u | U Nreal | System file of the Unreal Engine | |
| .u3d | Ultimate 3D model file format | Ultimate 3D 3D model file format | |
| .u3p | - | Program executable on U3 -compliant USB stick | |
| .uc2 | U ltra C ompressor II | File compressed with UltraCompressor 2 | |
| .ucf | Xilinx U ser C onstraint F ile | ASCII file, defines restrictions for a hardware design at logic level | |
| .UFO | U lead F ile for O bjects / U nlimited F ile O rdering | Image & object file from Ulead PhotoImpact / configuration file of the UFO file manager | |
| .uga | U lead G if A nimator | Ulead GIF object file | |
| .uha | UHA RC Compressed Archive | Archives, created with WinUHA or similar, see UHARC . | |
| .uhs | UHS Ultimate Hint System | File format specially developed for gaming solutions. | |
| .ui | Qt U ser I nterface | User interface design file. Used e.g. B. in KDevelop . | |
| .uif | U niversal I mage F ormat | Disc (CD / DVD) images / archives, created / compressed / mounted with MagicISO and / or virtual disk emulator MagicDISC | |
| .uka | U nfall- K tendrils and A bsenzenmanagement system | Data archive file of the UKA program | |
| .ult | Ul tra T racker | Tracker module ( music format ) of the ultra tracker | |
| .umod | U Nreal mod ification | Mod for Unreal / Unreal Tournament | |
| .unr | Unr eal Map | Map in Unreal / Unreal Tournament | |
| .uom | Update-O-Matic file | - | |
| .uoml | U nique O bject M arkup L anguage | UOML is an XML-based markup language of the uniqueobject management system | |
| .upd | Ulead Private Data | Corel VideoStudio temporary project file (previously: Ulead VideoStudio) | |
| .urd | ultra recall database | Ultrarecall database file | |
| .url | Internet link | Link to an Internet URL | |
| .usr | - | Export file for lyrics from the online song database SongSelect | |
| .ut2 | UT 2 003/ 2 004 Map | Map in Unreal Tournament 2003/2004 | |
| .utx | U Nreal T e x ture | Texture packs of the Unreal Engine | |
| .uu | UU ncoded file | ASCII -coded binary data ( WinRAR archive) | |
| .uue | UUe ncoded file | ASCII encoded binary data - UUencode | |
| .uv2 | µVision | Project file of the embedded compiler Keil µVision 2 & 3 | |
| .uvproj | µVision4 Project | Project file of the embedded compiler Keil µVision 4 | |
| .uvprojx | µVision5 Project | Project file of the embedded compiler Keil µVision 5 | |
| .uwu | bottom line Web Update | Update file from the bottom line | |
| . uxf | UML exchange format | Format for encoding, publishing and exchanging UML models |