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| File extension | The full name of the file |
|---|---|
| .U3D file extension | Universal 3D |
| .UAX file extension | Unreal Audio |
| .UIF file extension | MagicISO Universal Image Format |
| .UPD file extension | Update |
| .UPG file extension | Firmware Upgrade |
| .USR file extension | User Specific Settings |
| .U file extension | Subsampled Raw YUV Bitmap Image |
| .U00 file extension | Commodore C64 Universal |
| .U01 file extension | Barudan Embroidery |
| .U08 file extension | UFile Data |
| .U10 file extension | UFile 2010 Tax Return |
| .U11 file extension | UFile 2011 Tax Return |
| .U12 file extension | UFile 2012 Tax Return |
| .U255LAW file extension | Exponential 8-bit Sound |
| .U2CAR file extension | NFS:U2 Car |
| .U32 file extension | Authorware Cover |
| .U3I file extension | U3 Application Information |
| .U3P file extension | U3 Platform Install |
| .U8 file extension | Lemings 3D Audio |
| .U96 file extension | EasyZip Temporary |
| .U98 file extension | USA 98 Streets & Destinations Tour |
| .UAE file extension | WinUAE Configuration |
| .UAL file extension | Entrust Unattended Login Credentials |
| .UAP file extension | WAP User Agent Profile |
| .UAQ file extension | Microsoft Windows Action Queue |
| .UAS file extension | Ulead PhotoImpact Backup |
| .UAV file extension | OpenPilot UAV Settings |
| .UB file extension | 8-bit Unsigned Byte RAW Data |
| .UB1 file extension | X-Driven DRS-1100 Recorded Video |
| .UBB file extension | BEA ELink Adapter Configuration |
| .UBD file extension | BASIC UBAS |
| .UBF file extension | MXT3010 Universal Boot Format |
| .UBI file extension | Ubisoft Logo Animation |
| .UBIFS file extension | Linux UBIFS Image |
| .UBJ file extension | Universal Binary JSON Fiile |
| .UBK file extension | Embiid Ebook |
| .UBL file extension | DM35x User Boot Loader |
| .UBM file extension | IPhoto Mtwain Install |
| .UBOX file extension | Universe Sandbox Saved Data |
| .UBR file extension | IIS WCAT Configuration |
| .UBS file extension | Tracesrv Bugslayer Utility |
| .UC file extension | UnrealScript Class |
| .UC2 file extension | UltraCompressor II Compressed Archive |
| .UCCAPILOG file extension | Microsoft Windows Live Messenger UCC API Log |
| .UCD file extension | Prosa Diagram |
| .UCE file extension | Microsoft Windows XP System32 |
| .UCF file extension | Epson Personal Settings Information |
| .UCI file extension | Samsung YP-P2 Theme |
| .UCL file extension | Unreal Tournament Cache |
| .UCLS file extension | ObjectAid UML Explorer Class Diagram |
| .UCM file extension | Urban Chaos Game File |
| .UCN file extension | U-Act Configurator Configuration Storage |
| .UCP file extension | Uniformity Correction Parameters |
| .UCR file extension | MicroSim PCBoard Unrouted Nets Report |
| .UCS file extension | Homeworld Localized Unicode Strings |
| .UCSETTINGS file extension | Universal Converter Settings |
| .UCT file extension | Ultrasound Computed Tomography |
| .UCV file extension | Universal Converter Conversion |
| .UCX file extension | Rational XDE |
| .UD file extension | OmniPage User Dictionary |
| .UDA file extension | ZEMAX Model Data |
| .UDB file extension | Microsoft Works |
| .UDC file extension | System Management Server |
| .UDCX file extension | Microsoft Office Universal Data Connection |
| .UDEB file extension | Debian Package |
| .UDF file extension | Windows NT Uniqueness Database |
| .UDG file extension | UDraw(Graph) |
| .UDI file extension | CorelDRAW Draw Script Textures Bitmap |
| .UDID file extension | Google Android Unique Device IDentifier |
| .UDIF file extension | Apple Mac OS X Universal Disk Image Format |
| .UDK file extension | Unreal Map |
| .UDL file extension | Microsoft Data Link |
| .UDM file extension | MapView User Module |
| .UDO file extension | Moray UDO 3D |
| .UDP file extension | Corel VideoStudio Scene Information |
| .UDS file extension | NHTSA UDS-1992 Crash Test Data |
| .UDSTATE file extension | Motorola Media Finder |
| .UDT file extension | User Defined Type Data Or VisiLogic Utilities |
| .UDW file extension | Raw Unsigned DoubleWord (32-bit) Data |
| .UDX file extension | PI Expert Design Software |
| .UEA file extension | Protector Suite QL |
| .UEAF file extension | Upek Protected Single |
| .UEED file extension | Uconomix Encryption Engine Encrypted Directory |
| .UEM file extension | LDC Region |
| .UENC file extension | UltraEdit Encrypted Text |
| .UES file extension | Ulead Photo Explorer Slide Show |
| .UEW file extension | UltraEdit Wordfile |
| .UEZ file extension | Ulead COOL 3D Graphics |
| .UFA file extension | GIF Animator Animation Object Information |
| .UFC file extension | SATURN Suite |
| .UFDL file extension | Universal Forms Description Language |
| .UFDR file extension | UFED Physical Analyzer Report Package |
| .UFF file extension | DataWave SciWorks Physiological Data |
| .UFI file extension | UFOCaptureV2 |
| .UFM file extension | Unicode TrueType Font |
| .UFO file extension | Ulead PhotoImpact Object |
| .UFP file extension | Ulead Photo Project |
| .UFS file extension | FreeBSD PC-BSD Unix File System |
| .UFS.UZIP file extension | FreeBSD Compressed Unix File System |
| .UFX file extension | Ultimate 3D Game Engine Material |
| .UGD file extension | Need For Speed Underground |
| .UGF file extension | Go Game |
| .UGR file extension | Apophysis Gradient |
| .UGS file extension | Unknown File Extension |
| .UHA file extension | UHARC Compressed Archive |
| .UHH file extension | Eurotherm Hydra History Encrypted |
| .UHS file extension | Universal Hint System Binary |
| .UHTM file extension | Unreal Tournament |
| .UHTML file extension | UHTML Document |
| .UI file extension | User Interface |
| .UIBAK file extension | UltraISO Backup Disk Image |
| .UIC file extension | COCO Unit ICon |
| .UID file extension | IBM Voice Type Users |
| .UID-ZPS file extension | Zoner Photo Studio Picture Autobackup |
| .UIH file extension | Geoworks UI Compiler Espire Header |
| .UIL file extension | IBM AIX User Interface Language |
| .UIN file extension | ICQ 2001 Saved ICQ Contact Information |
| .UIR file extension | LabWindows User Interface Resource |
| .UIS file extension | WindowBlinds Personality |
| .UIT file extension | UIX XML Template |
| .UIX file extension | UiXML Page |
| .UIZ file extension | Spybot Search & Destroy Updater |
| .UK file extension | English (British) Language Translation |
| .UKA file extension | Fifa World Cup Game Data |
| .UKE file extension | Ulead VideoStudio |
| .UKO file extension | UK Offshore Operators Association (OKOOA) P1/90 Data |
| .UKS file extension | Microsoft Works |
| .UKX file extension | Unreal Tournament Animation |
| .UKY file extension | UltraMixer Licence Key |
| .ULAW file extension | Raw CCITT/ITU G.711 US Telephony Audio Format |
| .ULB file extension | COBOL Unisys Library |
| .ULD file extension | Unified Luminaire Datafile |
| .ULF file extension | Universal List |
| .ULG file extension | ULG Bitmap |
| .ULP file extension | EAGLE Script |
| .ULS file extension | NetMeeting User Location Service |
| .ULT file extension | Ultratracker Music Module (MOD) |
| .ULW file extension | Raw CCITT/ITU G.711 US Telephony Audio Format |
| .ULX file extension | Glulx Data |
| .ULYS file extension | Ulysses Project |
| .ULZ file extension | USBlyzer Data Capture |
| .UMB file extension | MemMaker Backup |
| .UMD file extension | UMD Mobile Ebook |
| .UMF file extension | File Transport |
| .UML file extension | Visual UML Class Diagram & Model |
| .UMLCLASS file extension | Java UML Class Model |
| .UMLX file extension | Visual UML XML Model |
| .UMM file extension | Unified Molecular Modeling |
| .UMOD file extension | Unreal Tournament MOD Installation Package |
| .UMP file extension | UModel Project |
| .UMR file extension | MyEclipse UML Model Repository |
| .UMV file extension | Are You Afraid Of The Dark? Video |
| .UMX file extension | Unreal Tournament Music Package |
| .UNA file extension | SIMS Unauthorized Data |
| .UNAUTH file extension | SiteMinder Unauthorized Message |
| .UNCOMPRESSED_SIZE file extension | Singularity Game |
| .UND file extension | Urban Network Data |
| .UNDEFINED file extension | Undefined |
| .UNDF file extension | Undefined File Format |
| .UNDO file extension | Backup |
| .UNF file extension | Btreive Unformatted |
| .UNI file extension | Forecast Pro Data |
| .UNIC file extension | Unic Tracker Sound |
| .UNITXT file extension | YS FLIGHT Language |
| .UNITY file extension | Unity Scene |
| .UNITY3D file extension | Unity Scene Web Player |
| .UNITYPACKAGE file extension | Unity Package |
| .UNITYPROJ file extension | Unity 3D Project |
| .UNIT_VARIANT file extension | Total War Unit Variant Settings |
| .UNIX file extension | Unix |
| .UNIXYZ file extension | UniChem XYZ Chemical Modeller Input |
| .UNK file extension | UVProbe |
| .UNKNOWN file extension | Unknown File Extension |
| .UNL file extension | Garmin MapSource Unlock |
| .UNQ file extension | ACT! 3.0 Email Message Attachment |
| .UNR file extension | Unreal Map |
| .UNS file extension | Visual Navigation Suite Export Or Import Settings |
| .UNT file extension | AutoCAD Unit Definition |
| .UNUSED file extension | Photoline 4 Defaults |
| .UNV file extension | BusinessObjects Universe |
| .UNX file extension | Unix Text |
| .UOF file extension | Uniform Office Format |
| .UOL file extension | PhotoImpact Clipart Image |
| .UOP file extension | Unified Office Format Presentation |
| .UOS file extension | Unified Office Format Spreadsheet |
| .UOT file extension | Unified Office Format Text |
| .UP2 file extension | Ulead Cool 3D Plugins Board |
| .UPA file extension | Fake Download |
| .UPB file extension | Mvision Firmware Update |
| .UPC file extension | Ultimate Paint Component File Format |
| .UPDATE file extension | ISAPI Update |
| .UPDF file extension | UltraPdf Publication |
| .UPF file extension | Nokia Phone Digital Photo |
| .UPI file extension | Ulead PhotoImpact Plugin |
| .UPJ file extension | Ulead Project |
| .UPK file extension | Unreal 3 Game Data Package |
| .UPK0 file extension | Metro 2033 Game |
| .UPL file extension | StarMoney Agent Download |
| .UPLOAD file extension | Upload |
| .UPM file extension | PenMail |
| .UPO file extension | DBASE Compiled Update Data |
| .UPOI file extension | IGO Points Of Interest |
| .UPP file extension | Ghostscript Uniprint Unified Printer Parameter |
| .UPR file extension | FileMaker User Spelling Dictionary |
| .UPS file extension | Microsoft Works |
| .UPT file extension | Connectivity Memory Model Update Timing Input |
| .UPX file extension | Ulead Photo Express Saved Image |
| .UPZ file extension | StarMoney Agent Download |
| .UQM file extension | The Ur-Quan Masters Archive |
| .URC file extension | Unicenter Remote Control |
| .URD file extension | Uno Reflection Data |
| .URD-JOURNAL file extension | Ultra Recall Journal Update |
| .URF file extension | Radar ViewPoint Universal Radar Format |
| .URI file extension | List Of Uniform Resource Identifiers |
| .URIS file extension | Uniform Resource Identifiers |
| .URL file extension | Internet Shortcut - URL - Uniform Resource Locator |
| .URLS file extension | GetRight Internet Shortcuts List |
| .URL_ file extension | Internet Shortcut - URL - Uniform Resource Locator |
| .URP file extension | Universal Report |
| .URQ file extension | Review QuickChart Chart |
| .URR file extension | Uniface Signatures |
| .URS file extension | ControlDraw User Requirement Specifier |
| .URT file extension | Utah Run-Length Encoded Bitmap Image |
| .US file extension | English Language Translation |
| .US? file extension | Microsoft Word Font |
| .USA file extension | Microsoft Office Headers |
| .USB file extension | SiSoftware Sandra |
| .USBSO file extension | Teledyne LeCroy Protocol Analyzer Settings |
| .USC file extension | USC Module Definition |
| .USD file extension | Epson Print Image Frame |
| .USDX file extension | Tom Clancys Rainbow Six: Vegas Game |
| .USECASEDIAGRAM file extension | Microsoft Visual Studio Use Case Diagram |
| .USEQ file extension | USeq Genome Data |
| .USER file extension | Microsoft Visual Studio Project User Options |
| .USERPROFILE file extension | Symantec User Profile |
| .USERSETTINGS file extension | User Settings |
| .USERTILE-MS file extension | Microsoft Windows 8 Release Preview User Tile |
| .USF file extension | Core Media Player XML Universal Subtitle Format |
| .USFLIB file extension | Nintendo 64 Song Library |
| .USG file extension | PC-Doctor For Windows |
| .USH file extension | Creston SIMPL Windows |
| .USI file extension | UsiXML UI Description |
| .USKN file extension | KSDev ThemeEngine Theme |
| .USL file extension | LaserJet Landscape Font |
| .USM file extension | ScaleForm GFX Video |
| .USP file extension | PageMaker Printer Font |
| .USRP file extension | UTM Universe Polar Stereographic |
| .USS file extension | WinUAE Saved State |
| .UST file extension | WiFi SiStr Exported User Theme |
| .USTAR file extension | Uniform Standard Tape Archive Format |
| .USV file extension | LG Xenon Mobile Phone Contact List |
| .USX file extension | Unreal StaticMesh (hardware Brushes) |
| .UT2 file extension | Unreal Tournament Map |
| .UT2MOD file extension | Unreal Tournament 2003 MOD Installation Package |
| .UT3 file extension | Unreal Tournament 3 Map |
| .UT4MOD file extension | Unreal Tournament 2004 MOD Installation Package |
| .UTB file extension | µTBackup Backup |
| .UTC file extension | BioWare Aurora Game Engine Creature |
| .UTD file extension | BioWare Aurora Game Engine Door |
| .UTE file extension | BioWare Aurora Game Engine Encounter |
| .UTF file extension | AOL Updating Files |
| .UTF8 file extension | Unicode UTF-8 Encoded Text |
| .UTI file extension | Spybot - Search & Destroy Includes |
| .UTL file extension | QuickBooks Data |
| .UTM file extension | BioWare Aurora Game Engine Store |
| .UTP file extension | BioWare Aurora Game Engine Placeable Object |
| .UTPART file extension | µTorrent Unfinished Download |
| .UTS file extension | Spybot - Search & Destroy Include |
| .UTT file extension | BioWare Aurora Engine Trigger |
| .UTW file extension | BioWare Aurora Engine Waypoint |
| .UTX file extension | Unreal Texture |
| .UTXT file extension | Unicode Text |
| .UTZ file extension | Symbian OS User Interface Theme |
| .UU file extension | Uuencoded (compressed) File Archive (ascii) |
| .UUD file extension | UUDecoded |
| .UUE file extension | UUEncoded |
| .UUS file extension | Ultra Utility Skin |
| .UV2 file extension | Janes Combat Simulations: F-15 |
| .UVCAB file extension | UVScreenCamera Films |
| .UVF file extension | UVScreenCamera Films |
| .UVNTS file extension | UVScreenCamera Notes |
| .UVO file extension | Sanyo Katana DLX Voice Memo |
| .UVP file extension | Ulead MediaStudio |
| .UVPROJ file extension | µVision4 Project |
| .UVR file extension | UVR Mesh |
| .UVS file extension | UVScreenCamera Segments |
| .UVSEG file extension | UVScreenCamera Segments |
| .UVW file extension | 3D Studio MAX UVW Coordinates |
| .UVX file extension | Unreal Tournament Saved Game |
| .UW file extension | Unsigned Word (16-bit) Music |
| .UWF file extension | UltraTracker WaveSample Music |
| .UWL file extension | Novell GroupWise User Word List |
| .UXDC file extension | Microsoft Excel Data Retrieval Service Connection |
| .UXF file extension | UMLet UML EXchange Format |
| .UXX file extension | Unreal Tournament 2003 Cache |
| .UXY file extension | Barudan Embroidery Outline |
| .UXZ file extension | IBM Flex CMM Update |
| .UYVY file extension | YUV 16-bit Image Format |
| .UZ2 file extension | Unreal Tournament Compressed |
| .UZE file extension | UltimateZip Compressed Archive |
| .UZIP file extension | FreeBSD Compressed Disk Image |
| .UZY file extension | Backdoor.Sokacaps |
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