| File extension | The full name of the file |
|---|---|
| File extension U | Subsampled Raw YUV Bitmap Image |
| File extension U00 | The Price Is Right 2010 Game |
| File extension U01 | Barudan Embroidery |
| File extension U08 | UFile Data |
| File extension U10 | UFile 2010 Tax Return Format |
| File extension U11 | UFile 2011 Tax Return Format |
| File extension U12 | UFile 2012 Tax Return Format |
| File extension U255LAW | Exponential 8-bit Sound |
| File extension U2CAR | NFS:U2 Car |
| File extension U32 | Authorware Cover |
| File extension U3D | Universal 3D Format |
| File extension U3I | U3 Application Information Format |
| File extension U3P | U3 Platform Install Format |
| File extension U8 | Lemings 3D Audio Format |
| File extension U96 | EasyZip Temporary |
| File extension UAE | WinUAE Configuration |
| File extension UAL | Entrust Unattended Login Credentials |
| File extension UAP | SIMATIC WinCC User Archive Export |
| File extension UAQ | Microsoft Windows Action Queue |
| File extension UAS | Ulead PhotoImpact Backup |
| File extension UAV | OpenPilot UAV Settings |
| File extension UAX | Unreal Audio Format |
| File extension UB | Unsigned Byte Audio Format |
| File extension UBIFS | Linux UBIFS Image |
| File extension UBJ | Universal Binary JSON Fiile |
| File extension UBM | IPhoto Mtwain Install |
| File extension UBOX | Universe Sandbox Saved Data Format |
| File extension UBR | IIS WCAT Configuration |
| File extension UC | UnrealScript Class |
| File extension UC2 | UltraCompressor II Compressed Archive Format |
| File extension UCCAPILOG | Microsoft Windows Live Messenger UCC API Log Format |
| File extension UCD | Prosa Diagram |
| File extension UCE | Microsoft Windows XP System32 Format |
| File extension UCF | WebEx Universal Communications Format |
| File extension UCI | UFS Explorer Backup Format |
| File extension UCL | Unreal Tournament Cache Format |
| File extension UCLS | ObjectAid UML Explorer Class Diagram |
| File extension UCM | Urban Chaos Game Format |
| File extension UCP | SmartWare Communications Profile |
| File extension UCR | MicroSim PCBoard Unrouted Nets Report |
| File extension UCS | Homeworld Localized Unicode Strings |
| File extension UCSETTINGS | Universal Converter Settings |
| File extension UCT | UC Browser Theme Format |
| File extension UCV | Universal Converter Conversion |
| File extension UCX | Rational XDE |
| File extension UD | OmniPage User Dictionary |
| File extension UDA | ZEMAX Model Data |
| File extension UDB | Dynamics AX User Database Format |
| File extension UDC | Adobe User Dictionary Format |
| File extension UDCX | Microsoft Office Universal Data Connection Format |
| File extension UDEB | Debian Package Format |
| File extension UDF | Universal Disk Format |
| File extension UDG | UDraw(Graph) |
| File extension UDI | CorelDRAW Draw Script Textures Bitmap |
| File extension UDID | Google Android Unique Device IDentifier |
| File extension UDIF | Apple Mac OS X Universal Disk Image Format |
| File extension UDK | Unreal Map Format |
| File extension UDL | Microsoft Data Link Format |
| File extension UDM | MapView User Module |
| File extension UDO | Moray UDO 3D |
| File extension UDP | Corel VideoStudio Scene Information |
| File extension UDS | FIMware Database Format |
| File extension UDW | Raw Unsigned DoubleWord (32-bit) Data |
| File extension UDX | PI Expert Design Software |
| File extension UEA | Protector Suite QL Format |
| File extension UEED | Uconomix Encryption Engine Encrypted Directory |
| File extension UENC | UltraEdit Encrypted Text |
| File extension UES | Ulead Photo Explorer Slide Show |
| File extension UEW | UltraEdit Wordfile |
| File extension UEZ | Ulead COOL 3D Graphics |
| File extension UFA | GIF Animator Animation Object Information |
| File extension UFC | SATURN Suite |
| File extension UFDR | UFED Physical Analyzer Report Package |
| File extension UFF | DataWave SciWorks Physiological Data |
| File extension UFI | UFOCaptureV2 |
| File extension UFO | Ulead PhotoImpact Object Format |
| File extension UFP | Ulead Photo Project |
| File extension UFR | Ultra Fractal Format |
| File extension UFS | FreeBSD PC-BSD Unix File System Format |
| File extension UFSUZIP | FreeBSD Compressed Unix File System Format |
| File extension UFX | Ultimate 3D Game Engine Material |
| File extension UGD | Need For Speed Underground |
| File extension UGR | Apophysis Gradient |
| File extension UHA | UHARC Compressed Archive |
| File extension UHH | Eurotherm Hydra History Encrypted |
| File extension UHS | Universal Hint System Binary |
| File extension UHTM | Unreal Tournament |
| File extension UHTML | UHTML Document Format |
| File extension UI | User Interface Format |
| File extension UIBAK | UltraISO Backup Disk Image |
| File extension UIC | COCO Unit ICon |
| File extension UID | IBM Voice Type Users |
| File extension UID-ZPS | Zoner Photo Studio Picture Autobackup |
| File extension UIF | MagicISO Universal Image Format |
| File extension UIL | IBM AIX User Interface Language |
| File extension UIN | ICQ 2001 Saved ICQ Contact Information |
| File extension UIR | LabWindows User Interface Resource |
| File extension UIS | WindowBlinds Personality Format |
| File extension UIT | UIX XML Template |
| File extension UIX | UiXML Page |
| File extension UIZ | Spybot Search & Destroy Updater |
| File extension UK | English (British) Language Translation |
| File extension UKA | Fifa World Cup Game Data |
| File extension UKS | Microsoft Works |
| File extension UKX | Unreal Tournament Animation Format |
| File extension UKY | UltraMixer Licence Key |
| File extension ULAW | Raw CCITT/ITU G.711 US Telephony Audio Format |
| File extension ULB | COBOL Unisys Library |
| File extension ULD | Unified Luminaire Datafile |
| File extension ULF | Universal List Format |
| File extension ULP | EAGLE Script |
File extensions in alphabetical order: U
The list of file extensions, sorted alphabetically, beginning with the letter U