| Estensione del file | Autore/Produttore | Descrizione del file |
|---|---|---|
| Estensione U | N/A | Unreal Tournament System Format |
| Estensione U00 | Ludia Inc. | The Price Is Right 2010 Game |
| Estensione U01 | Barudan | Barudan Embroidery |
| Estensione U08 | Dr Tax Software | UFile Data |
| Estensione U10 | Dr Tax Software | UFile 2010 Tax Return Format |
| Estensione U11 | Dr Tax Software | UFile 2011 Tax Return Format |
| Estensione U12 | Dr Tax Software | UFile 2012 Tax Return Format |
| Estensione U255LAW | N/A | Exponential 8-bit Sound |
| Estensione U2CAR | N/A | NFS:U2 Car |
| Estensione U32 | Adobe Systems Incorporated | Authorware Cover |
| Estensione U3D | 3D Industry Forum | Universal 3D Format |
| Estensione U3I | N/A | U3 Application Information Format |
| Estensione U3P | N/A | U3 Platform Install Format |
| Estensione U8 | Clockwork Games | Lemings 3D Audio Format |
| Estensione U96 | ConeXware, Inc. | EasyZip Temporary |
| Estensione UAE | N/A | WinUAE Configuration |
| Estensione UAL | Entrust | Entrust Unattended Login Credentials |
| Estensione UAP | Siemens AG | SIMATIC WinCC User Archive Export |
| Estensione UAQ | Microsoft Corporation | Microsoft Windows Action Queue |
| Estensione UAS | Ulead Systems | Ulead PhotoImpact Backup |
| Estensione UAV | OpenPilot Foundation | OpenPilot UAV Settings |
| Estensione UAX | N/A | Unreal Audio Format |
| Estensione UB | N/A | Unsigned Byte Audio Format |
| Estensione UBIFS | N/A | Linux UBIFS Image |
| Estensione UBJ | The Buzz Media | Universal Binary JSON Fiile |
| Estensione UBM | N/A | IPhoto Mtwain Install |
| Estensione UBOX | Universe Sandbox | Universe Sandbox Saved Data Format |
| Estensione UBR | Microsoft Corporation | IIS WCAT Configuration |
| Estensione UC | N/A | UnrealScript Class |
| Estensione UC2 | N/A | UltraCompressor II Compressed Archive Format |
| Estensione UCCAPILOG | Microsoft | Microsoft Windows Live Messenger UCC API Log Format |
| Estensione UCD | Insoft Oy. | Prosa Diagram |
| Estensione UCE | Microsoft | Microsoft Windows XP System32 Format |
| Estensione UCF | Cisco Systems | WebEx Universal Communications Format |
| Estensione UCI | SysDevSoftware | UFS Explorer Backup Format |
| Estensione UCL | Tripwire Interactive | Killing Floor System Format |
| Estensione UCLS | ObjectAid LLC | ObjectAid UML Explorer Class Diagram |
| Estensione UCM | Viva Media | Urban Chaos Game Format |
| Estensione UCP | SmartWare Corporation | SmartWare Communications Profile |
| Estensione UCR | Cadence Design Systems, Inc. | MicroSim PCBoard Unrouted Nets Report |
| Estensione UCS | Relic Entertainment Inc. | Homeworld Localized Unicode Strings |
| Estensione UCSETTINGS | Anthony R. Daly | Universal Converter Settings |
| Estensione UCT | UC Mobile | UC Browser Theme Format |
| Estensione UCV | Anthony R. Daly | Universal Converter Conversion |
| Estensione UCX | IBM | Rational XDE |
| Estensione UD | Nuance Communications | OmniPage User Dictionary |
| Estensione UDA | ZEMAX Development Corporation | ZEMAX Model Data |
| Estensione UDB | Microsoft | Dynamics AX User Database Format |
| Estensione UDC | Adobe Systems | Adobe User Dictionary Format |
| Estensione UDCX | Microsoft | Microsoft Office Universal Data Connection Format |
| Estensione UDEB | The Debian Project | Debian Package Format |
| Estensione UDF | Optical Storage Technology Association | Universal Disk Format |
| Estensione UDG | Universität Bremen | UDraw(Graph) |
| Estensione UDI | Corel Corporation | CorelDRAW Draw Script Textures Bitmap |
| Estensione UDID | Google Inc. | Google Android Unique Device IDentifier |
| Estensione UDIF | Apple, Inc. | Apple Mac OS X Universal Disk Image Format |
| Estensione UDK | Epic Games | Unreal Map Format |
| Estensione UDL | Microsoft | Microsoft Data Link Format |
| Estensione UDM | MotCreations.com | MapView User Module |
| Estensione UDO | N/A | Moray UDO 3D |
| Estensione UDP | Corel Corporation | Corel VideoStudio Scene Information |
| Estensione UDS | HSRA | Uniform Data System Format |
| Estensione UDW | N/A | Raw Unsigned DoubleWord (32-bit) Data |
| Estensione UDX | Power Integrations | PI Expert Design Software |
| Estensione UEA | AuthenTec | Protector Suite QL Format |
| Estensione UEED | Uconomix Technologies | Uconomix Encryption Engine Encrypted Directory |
| Estensione UENC | IDM Computer Solutions, Inc. | UltraEdit Encrypted Text |
| Estensione UES | Corel Corporation | Ulead Photo Explorer Slide Show |
| Estensione UEW | IDM Computer Solutions, Inc. | UltraEdit Wordfile |
| Estensione UEZ | Ulead Systems | Ulead COOL 3D Graphics |
| Estensione UFA | N/A | GIF Animator Animation Object Information |
| Estensione UFC | Atkins-ITS Transport Software | SATURN Suite |
| Estensione UFDR | Cellebrite Mobile Synchronization LTD. | UFED Physical Analyzer Report Package |
| Estensione UFF | DataWave Technologies | DataWave SciWorks Physiological Data |
| Estensione UFI | SonotaCo | UFOCaptureV2 |
| Estensione UFO | Ulead | Ulead PhotoImpact Object Format |
| Estensione UFP | Corel Corporation | Ulead Photo Project |
| Estensione UFR | Frederik Slijkerman | Ultra Fractal Format |
| Estensione UFS | The FreeBSD Project | FreeBSD PC-BSD Unix File System Format |
| Estensione UFSUZIP | The FreeBSD Project | FreeBSD Compressed Unix File System Format |
| Estensione UFX | Ultimate 3D | Ultimate 3D Game Engine Material |
| Estensione UGD | Electronic Arts, Inc. | Need For Speed Underground |
| Estensione UGR | Mark Townsend | Apophysis Gradient |
| Estensione UHA | UHarc | UHARC Compressed Archive |
| Estensione UHH | Eurotherm UK | Eurotherm Hydra History Encrypted |
| Estensione UHS | Jason Strautman | Universal Hint System Binary |
| Estensione UHTM | Epic Games, Inc. | Unreal Tournament |
| Estensione UHTML | UC Mobile | UC Browser Saved Webpage |
| Estensione UI | Nokia | User Interface Format |
| Estensione UIBAK | EZB Systems | UltraISO Backup Disk Image |
| Estensione UIC | N/A | COCO Unit ICon |
| Estensione UID | IBM | IBM Voice Type Users |
| Estensione UID-ZPS | ZONER, Inc. | Zoner Photo Studio Picture Autobackup |
| Estensione UIF | MagicISO | MagicISO Universal Image Format |
| Estensione UIL | IBM | IBM AIX User Interface Language |
| Estensione UIN | ICQ LLC | ICQ 2001 Saved ICQ Contact Information |
| Estensione UIR | National Instruments Corporation | LabWindows User Interface Resource |
| Estensione UIS | Stardock | WindowBlinds Personality Format |
| Estensione UIT | N/A | UIX XML Template |
| Estensione UIX | Oracle Corporation | UiXML Page |
| Estensione UIZ | Safer-Networking Ltd. | Spybot Search & Destroy Updater |
| Estensione UK | N/A | English (British) Language Translation |
| Estensione UKA | Electronic Arts, Inc. | Fifa World Cup Game Data |
| Estensione UKS | Microsoft Corporation | Microsoft Works |
| Estensione UKX | Epic Games | Unreal Tournament Animation Format |
| Estensione UKY | UltraMixer Digital Audio Solutions | UltraMixer Licence Key |
| Estensione ULAW | N/A | Raw CCITT/ITU G.711 US Telephony Audio Format |
| Estensione ULB | N/A | COBOL Unisys Library |
| Estensione ULD | DIAL GMBH | Unified Luminaire Datafile |
| Estensione ULF | N/A | Universal List Format |
| Estensione ULP | CadSoft Computer, Inc. | EAGLE Script |
| Estensione ULS | Microsoft | NetMeeting User Location Service Format |
| Estensione ULT | N/A | Ultratracker Music Module (MOD) Format |
| Estensione ULW | N/A | U-Law Audio Format |
| Estensione ULYS | The Soulmen | Ulysses Project |
| Estensione ULZ | USBlyzer | USBlyzer Data Capture Format |
| Estensione UMB | Microsoft Corporation | MemMaker Backup |
| Estensione UMD | jumd team | UMD Mobile Ebook |
| Estensione UMF | GetMediaHolder.com | MediaHolder Media Format |
| Estensione UML | N/A | Visual UML Class Diagram & Model Format |
| Estensione UMLCLASS | N/A | Java UML Class Model Format |
| Estensione UMLX | Visual Object Modelers, Inc. | Visual UML XML Model |
| Estensione UMM | N/A | Unified Molecular Modeling |
| Estensione UMOD | Epic Games | Unreal Tournament MOD Installation Package Format |
| Estensione UMP | Altova | UModel Project |
| Estensione UMR | Genuitec, LLC | MyEclipse UML Model Repository |
| Estensione UMS | Human Head Studios | Rune 3D Mesh Format |
| Estensione UMX | Epic Games | Unreal Tournament Music Package |
| Estensione UNA | Capita Business Services Ltd. | SIMS Unauthorized Data |
| Estensione UNAUTH | Netegrity | SiteMinder Unauthorized Message Format |
| Estensione UNCOMPRESSED_SIZE | Raven Software | Singularity Game |
| Estensione UNF | Novell, Inc. | Btreive Unformatted |
| Estensione UNI | N/A | UniMOD/MikMOD Music Module Format |
| Estensione UNITXT | N/A | YS FLIGHT Language |
| Estensione UNITY | Unity Technologies | Unity Scene Format |
| Estensione UNITY3D | Unity Technologies | Unity Scene Web Player Format |
| Estensione UNITYPACKAGE | Unity Technologies | Unity Package Format |
| Estensione UNITYPROJ | Unity Technologies | Unity 3D Project |
| Estensione UNIT_VARIANT | The Creative Assembly | Total War Unit Variant Settings |
| Estensione UNIX | The Open Group | Unix |
| Estensione UNK | N/A | Unknown Format |
| Estensione UNKNOWN | N/A | Unknown File Extension |
| Estensione UNL | Garmin | Garmin MapSource Unlock Format |
| Estensione UNQ | The Sage Group plc | ACT! 3.0 Email Message Attachment |
| Estensione UNR | N/A | Unreal Map Format |
| Estensione UNS | Nobeltec, Inc. | Visual Navigation Suite Export Or Import Settings |
| Estensione UNT | Autodesk | AutoCAD Unit Definition Format |
| Estensione UNUSED | Impressum | Photoline 4 Defaults |
| Estensione UNV | SAP AG | BusinessObjects Universe |
| Estensione UNX | N/A | Unix Text Format |
| Estensione UOF | N/A | Uniform Office Format |
| Estensione UOL | Ulead Systems | PhotoImpact Clipart Image |
| Estensione UOP | Electronic Arts | Ultima Online Patch Format |
| Estensione UOS | N/A | Unified Office Format Spreadsheet Format |
| Estensione UOT | N/A | Unified Office Format Text Format |
| Estensione UPC | J-T-L Development Inc. | Ultimate Paint Component |
| Estensione UPDATE | EggCentric | ISAPI Update Format |
| Estensione UPDATR | Nijikokun | IConomy Update Format |
| Estensione UPDF | Software995 | UltraPdf Publication |
| Estensione UPF | Bentley Systems | MicroStation User Preference Format |
| Estensione UPG | N/A | Firmware Upgrade Format |
| Estensione UPI | N/A | Ulead PhotoImpact Plugin |
| Estensione UPJ | N/A | Ulead Project |
| Estensione UPK | Epic Games | Unreal 3 Game Data Package Format |
| Estensione UPK0 | 4A Games | Metro 2033 Game |
| Estensione UPL | Star Finanz GmbH | StarMoney Agent Download |
| Estensione UPM | UC-Logic Technology Corp. | PenMail |
| Estensione UPO | dataBased Intelligence, Inc. | DBASE Compiled Update Data |
| Estensione UPOI | Nav N Go | IGO Points Of Interest Format |
| Estensione UPP | Artifex Software | Ghostscript Uniprint Unified Printer Parameter |
| Estensione UPR | FileMaker | FileMaker User Spelling Dictionary |
| Estensione UPS | Microsoft Corporation | Microsoft Works |
| Estensione UPX | Markus Oberhumer | Ultimate Packer For EXecutable Format |
| Estensione UPZ | Star Finanz GmbH | StarMoney Agent Download |
| Estensione UQM | The Ur-Quan Masters | The Ur-Quan Masters Archive Format |
| Estensione URC | CA Technologies | Unicenter Remote Control |
| Estensione URD | Kinook Software, Inc. | Ultra Recall Database |
| Estensione URD-JOURNAL | Kinook Software, Inc. | Ultra Recall Journal Update |
| Estensione URF | Matinsoft Inc. | AppFace Skin |
| Estensione URL | N/A | Internet Shortcut - URL - Uniform Resource Locator |
| Estensione URLS | Headlight Software, Inc. | GetRight Internet Shortcuts List |
| Estensione URL_ | N/A | Internet Shortcut - URL - Uniform Resource Locator |
| Estensione URP | Universal Software C. T. | Universal Report |
| Estensione URQ | Eurotherm UK | Review QuickChart Chart |
| Estensione URR | Compuware | Uniface Signatures Format |
| Estensione URS | ControlDraw Ltd. | ControlDraw User Requirement Specifier |
| Estensione URT | N/A | Utah Run-Length Encoded Bitmap Image Format |
| Estensione US | N/A | English Language Translation |
| Estensione US? | Microsoft Corporation | Microsoft Word Font |
| Estensione USA | Epic Games | Unreal Saved Game Format |
| Estensione USB | SiSoftware | SiSoftware Sandra |
| Estensione USC | Analogue Process Control Services | USC Module Definition |
| Estensione USECASEDIAGRAM | Microsoft Corporation | Microsoft Visual Studio Use Case Diagram |
| Estensione USEQ | Huntsman Cancer Institute | USeq Genome Data Format |
| Estensione USER | Microsoft | Microsoft Visual Studio Project User Options Format |
| Estensione USERPROFILE | Symantec | Norton Antivirus User Profile Format |
| Estensione USERTILE-MS | Microsoft | Microsoft Windows 8 Release Preview User Tile Format |
| Estensione USF | N/A | Nintendo Ultra 64 Sound Format |
| Estensione USFLIB | N/A | Nintendo 64 Song Library Format |
| Estensione USG | PC-Doctor, Inc. | PC-Doctor For Windows |
| Estensione USH | Creston Electronics, Inc. | Creston SIMPL Windows |
| Estensione USI | N/A | UsiXML UI Description |
| Estensione USL | Schneider Electric S.A. | ProWORX Nxt USL Loadable |
| Estensione USM | N/A | USM Game Video Format |
| Estensione USP | Adobe Systems Incorporated | PageMaker Printer Font |
| Estensione USR | FileMaker | FileMaker Pro Runtime Engine Database Application |
| Estensione USS | N/A | WinUAE Saved State |
| Estensione UST | UTAU | UTAU Sequence Format |
| Estensione USTAR | N/A | Uniform Standard Tape Archive Format |
| Estensione USX | N/A | Unreal StaticMesh (hardware Brushes) Format |
| Estensione UT2 | Epic Games | Unreal Tournament Map Format |
| Estensione UT2MOD | Epic Games | Unreal Tournament 2003 MOD Installation Package Format |
| Estensione UT3 | Epic Games | Unreal Tournament 3 Map Format |
| Estensione UT4MOD | Epic Games | Unreal Tournament 2004 MOD Installation Package Format |
| Estensione UT8 | Sick Puppies | Ghost Master Language Format |
| Estensione UTB | N/A | µTBackup Backup |
| Estensione UTC | BioWare | BioWare Aurora Game Engine Creature Format |
| Estensione UTD | BioWare | BioWare Aurora Game Engine Door |
| Estensione UTE | BioWare | BioWare Aurora Game Engine Encounter |
| Estensione UTF8 | N/A | Unicode UTF-8 Encoded Text |
| Estensione UTI | Safer-Networking Ltd. | Spybot - Search & Destroy Includes |
| Estensione UTL | Intuit Inc. | QuickBooks Data |
| Estensione UTM | BioWare | BioWare Aurora Game Engine Store |
| Estensione UTP | BioWare | BioWare Aurora Game Engine Placeable Object |
| Estensione UTPART | BitTorrent, Inc. | µTorrent Unfinished Download |
| Estensione UTS | Safer-Networking Ltd. | Spybot - Search & Destroy Include |
| Estensione UTT | BioWare | BioWare Aurora Engine Trigger |
| Estensione UTW | Aubrey Falconer | Unity Whirld Format |
| Estensione UTX | N/A | Unreal Texture Format |
| Estensione UTZ | UIQ Technology | UIQ Theme Package |
| Estensione UU | N/A | Uuencoded (compressed) File Archive (ascii) |
| Estensione UUD | N/A | UUDecoded Format |
| Estensione UUE | N/A | UUEncoded Format |
| Estensione UUS | BobaFett | Ultra Utility Skin |
| Estensione UV2 | ARM Holdings plc | µVision Project |
| Estensione UVCAB | UVsoftium | UVScreenCamera Films |
| Estensione UVF | N/A | Uncertain Value Format |
| Estensione UVNTS | UVsoftium | UVScreenCamera Notes |
| Estensione UVPROJ | ARM Holdings plc | µVision4 Project |
| Estensione UVR | N/A | UVR Mesh |
| Estensione UVS | UVsoftium | UVScreenCamera Segments |
| Estensione UVSEG | N/A | UVScreenCamera Segments |
| Estensione UVW | Autodesk, Inc. | 3D Studio MAX UVW Coordinates |
| Estensione UVX | Epic Games | Unreal Tournament Saved Game |
| Estensione UW | N/A | Unsigned Word (16-bit) Music Format |
| Estensione UWF | N/A | UltraTracker WaveSample Music Format |
| Estensione UWL | Corel | Corel WordPerfect User Word List Format |
| Estensione UXDC | Microsoft Corporation | Microsoft Excel Data Retrieval Service Connection |
| Estensione UXF | UMLet Team | UMLet UML EXchange Format |
| Estensione UXX | N/A | Unreal Tournament 2003 Cache Format |
| Estensione UXY | Barudan | Barudan Embroidery Outline |
| Estensione UYVY | N/A | YUV 16-bit Image Format |
| Estensione UZ2 | Epic Games, Inc. | Unreal Tournament Compressed |
| Estensione UZE | SWE von Schleusen | UltimateZip Compressed Archive |
| Estensione UZIP | Maxim Sobolev | FreeBSD Compressed Disk Image Format |
| Estensione UZY | N/A | Backdoor.Sokacaps |
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