List in alphabetic order - U
- U Unreal Tournament Class Package
- U00 The Price Is Right 2010 Game
- U01 Barudan Embroidery
- U08 UFile Data
- U10 UFile 2010 Tax Return
- U11 UFile 2011 Tax Return
- U12 UFile 2012 Tax Return
- U255LAW Exponential 8-bit Sound
- U2CAR NFS:U2 Car
- U32 Authorware Cover
- U3D Universal 3D Format
- U3I U3 Application Information Format
- U3P U3 Smart Application
- U8 3D Lemmings Audio Format
- U96 EasyZip Temporary
- UAE WinUAE Configuration
- UAL Entrust Unattended Login Credentials
- UAP SIMATIC WinCC User Archive Export
- UAQ Microsoft Windows Action Queue
- UAS Ulead PhotoImpact Backup
- UAV OpenPilot UAV Settings
- UAX Unreal Audio Package
- UB Unsigned Byte Audio Format
- UBIFS Linux UBIFS Image
- UBJ Universal Binary JSON Format
- UBM IPhoto Mtwain Install
- UBOX Universe Sandbox Data Format
- UBR IIS WCAT Configuration
- UC UnrealScript Class
- UC2 UltraCompressor 2 Archive
- UCCAPILOG Microsoft UCC API Log Format
- UCD Prosa Diagram
- UCE Windows UCE System Format
- UCF WebEx Media Format
- UCI UFS Explorer Backup Format
- UCL Unreal Tournament Cache Format
- UCLS ObjectAid UML Explorer Class Diagram
- UCM Crazy Machines Model Format
- UCP SmartWare Communications Profile
- UCR MicroSim PCBoard Unrouted Nets Report
- UCS Homeworld Localized Unicode Strings
- UCSETTINGS Universal Converter Settings
- UCT UC Browser Theme Format
- UCV Universal Converter Conversion
- UCX Rational XDE
- UD OmniPage User Dictionary
- UDA ZEMAX Model Data
- UDB Dynamics AX User Database Format
- UDC Adobe InDesign User Dictionary
- UDCX Universal Data Connection Format
- UDEB Debian Package Format
- UDF Universal Disk Format
- UDG UDraw(Graph)
- UDI CorelDRAW Draw Script Textures Bitmap
- UDID Google Android Unique Device IDentifier
- UDIF Apple Mac OS X Universal Disk Image Format
- UDK Unreal Engine Map Format
- UDL Microsoft Universal Data Link Format
- UDM MapView User Module
- UDO Moray UDO 3D
- UDP Corel VideoStudio Scene Information
- UDS FIMware Database Format
- UDW Raw Unsigned DoubleWord (32-bit) Data
- UDX PI Expert Design Software
- UEA Protector Suite QL Encrypted Archive
- UEED Uconomix Encryption Engine Encrypted Directory
- UENC UltraEdit Encrypted Text
- UES Ulead Photo Explorer Slide Show
- UEW UltraEdit Wordfile
- UEZ Ulead COOL 3D Graphics
- UFA GIF Animator Animation Object Information
- UFC SATURN Suite
- UFDR UFED Physical Analyzer Report Package
- UFF DataWave SciWorks Physiological Data
- UFI UFOCaptureV2
- UFO Ulead Format Object
- UFP Ulead Photo Project
- UFR Ultra Fractal Format
- UFS FreeBSD Unix Format System Format
- UFSUZIP Compressed Unix Format System Format
- UFX Ultimate 3D Game Engine Material
- UGD Need For Speed Underground
- UGR Apophysis Gradient
- UHA UHarc Compressed Archive
- UHH Eurotherm Hydra History Encrypted
- UHS Universal Hint System Binary
- UHTM Unreal Tournament
- UHTML UHTML Document Format
- UI User Interface Format
- UIBAK UltraISO Backup Disk Image
- UIC COCO Unit ICon
- UID IBM Voice Type Users
- UID-ZPS Zoner Photo Studio Picture Autobackup
- UIF Universal Image Format Disc Image
- UIL IBM AIX User Interface Language
- UIN ICQ 2001 Saved ICQ Contact Information
- UIR LabWindows User Interface Resource
- UIS WindowBlinds User Interface Specification
- UIT UIX XML Template
- UIX UiXML Page
- UIZ Spybot Search & Destroy Updater
- UK English (British) Language Translation
- UKA Fifa World Cup Game Data
- UKS Microsoft Works
- UKX Unreal Animation Package
- UKY UltraMixer Licence Key
- ULAW Raw U-Law Audio Format
- ULB COBOL Unisys Library
- ULD Unified Luminaire Datafile
- ULF Universal List Format
- ULP EAGLE Script
- ULS NetMeeting User Location Service Format
- ULT UltraTracker Module
- ULW U-Law Audio Format
- ULYS Ulysses Project
- ULZ USBlyzer Data Capture Format
- UMB MemMaker Backup
- UMD UMD Mobile Ebook
- UMF MediaHolder Universal Media Format
- UML UML Data Object Model
- UMLCLASS UML Class Model
- UMLX Visual UML XML Model
- UMM Unified Molecular Modeling
- UMOD Unreal Tournament Module Format
- UMP UModel Project
- UMR MyEclipse UML Model Repository
- UMS Rune 3D Mesh Format
- UMX Deus Ex Format
- UNA SIMS Unauthorized Data
- UNAUTH SiteMinder Unauthorized Message Format
- UNCOMPRESSED_SIZE Singularity Game
- UNF Btreive Unformatted
- UNI MikMod UniMOD Module
- UNITXT YS FLIGHT Language
- UNITY Unity Scene Format
- UNITY3D Unity Web Player Format
- UNITYPACKAGE Unity Package Format
- UNITYPROJ Unity 3D Project
- UNIT_VARIANT Total War Unit Variant Settings
- UNIX Unix
- UNK UVProbe Format
- UNKNOWN Unknown Format Type
- UNL Garmin Unlock Format
- UNQ ACT! 3.0 Email Message Attachment
- UNR Unreal Level Map
- UNS Visual Navigation Suite Export Or Import Settings
- UNT AutoCAD Unit Definition Format
- UNUSED Photoline 4 Defaults
- UNV BusinessObjects Universe
- UNX Unix Text Format
- UOF Uniform Office Document
- UOL PhotoImpact Clipart Image
- UOP Uniform Office Presentation
- UOS Uniform Office Spreadsheet
- UOT Uniform Office Document
- UPC Ultimate Paint Component
- UPD Program Update Information
- UPDATE ISAPI Update Format
- UPDATR IConomy Update Format
- UPDF UltraPdf Publication
- UPF Nokia Phone Digital Photo Format
- UPG Firmware Upgrade Format
- UPI Ulead PhotoImpact Plugin
- UPJ Ulead Project
- UPK Unreal Engine 3 Package
- UPK0 Metro 2033 Game
- UPL StarMoney Agent Download
- UPM PenMail
- UPO DBASE Compiled Update Data
- UPOI IGO Points Of Interest Format
- UPP Ghostscript Uniprint Unified Printer Parameter
- UPR FileMaker User Spelling Dictionary
- UPS Microsoft Works
- UPX Ultimate Packer For EXecutables Format
- UPZ StarMoney Agent Download
- UQM The Ur-Quan Masters Game Data Format
- URC Unicenter Remote Control
- URD Ultra Recall Database
- URD-JOURNAL Ultra Recall Journal Update
- URF AppFace Skin
- URL Internet Shortcut
- URLS GetRight Internet Shortcuts List
- URL_ Internet Shortcut - URL - Uniform Resource Locator
- URP Universal Report
- URQ Review QuickChart Chart
- URR Uniface Signatures Format
- URS ControlDraw User Requirement Specifier
- URT Utah Raster Toolkit Format
- US English Language Translation
- US? Microsoft Word Font
- USA Microsoft Office Headers Format
- USB SiSoftware Sandra
- USC USC Module Definition
- USECASEDIAGRAM Microsoft Visual Studio Use Case Diagram
- USEQ USeq Genome Data Format
- USER Visual Studio Project User Options Format
- USERPROFILE Norton Antivirus User Profile Format
- USERTILE-MS Windows 8 User Tile Format
- USF Nintendo 64 Music Format
- USFLIB Nintendo 64 Song Library
- USG PC-Doctor For Windows
- USH Creston SIMPL Windows
- USI UsiXML UI Description
- USL ProWORX Nxt USL Loadable
- USM USM Game Video Format
- USP PageMaker Printer Font
- USR FileMaker Pro Database Format
- USS WinUAE Saved State
- UST WiFi SiStr Exported User Theme Format
- USTAR Uniform Standard Tape Archive Format
- USX Unreal Static Meshes
- UT2 Unreal Tournament Map
- UT2MOD Unreal Tournament 2003/2004 Module Format
- UT3 Unreal Tournament 3 Map Format
- UT4MOD Unreal Tournament 2004 Module
- UT8 Ghost Master Language Format
- UTB µTBackup Backup
- UTC Bioware Creature Format
- UTD BioWare Aurora Game Engine Door
- UTE BioWare Aurora Game Engine Encounter
- UTF8 Unicode UTF8-Encoded Text Document
- UTI Spybot - Search & Destroy Includes
- UTL QuickBooks Data
- UTM BioWare Aurora Game Engine Store
- UTP BioWare Aurora Game Engine Placeable Object
- UTPART µTorrent Unfinished Download
- UTS Spybot - Search & Destroy Include
- UTT BioWare Aurora Engine Trigger
- UTW Unity Whirld Format
- UTX Unreal Texture Package
- UTXT Unicode Text Format
- UTZ UIQ Theme Package
- UU Uuencoded Format
- UUD UUDecoded Format
- UUE Uuencoded Format
- UUS Ultra Utility Skin
- UV2 µVision Project
- UVCAB UVScreenCamera Films
- UVF Uncertain Value Format
- UVNTS UVScreenCamera Notes
- UVPROJ µVision4 Project
- UVR UVR Mesh
- UVS UVScreenCamera Segments
- UVSEG UVScreenCamera Segments
- UVW 3D Studio MAX UVW Coordinates
- UVX Unreal Tournament 2003 Saved Game
- UW Unsigned Word Audio Format
- UWF UltraTracker Wave Format
- UWL User Word List Format
- UXDC Microsoft Excel Data Retrieval Service Connection
- UXF UMLet UML EXchange Format
- UXX Unreal Tournament Cache
- UXY Barudan Embroidery Outline
- UYVY YUV 16-bit Image Format
- UZ2 Unreal Tournament Compressed
- UZE UltimateZip Compressed Archive
- UZIP FreeBSD Compressed Disk Image
- UZY Backdoor.Sokacaps