U Unreal Tournament 2003 System File (Epic Games, Inc.)

U Subsampled Raw YUV Bitmap

U Unreal System File

U Nitpicker Ipflow File

U2 Telelogic Tau UML Model

U2E Unreal Game Translation

U2P Telelogic Tau UML Program Text File

U3D Universal 3D File

U3P U3 Platform Install File (U3 LLC.)

U4A UnInstaller Archive

U8 Raw Unsigned 8-Bit Audio Data

U96 EasyZip Temporary File

U98 Urdu 98 Document

UAE WinUAE 0.8.22 Game Configuration File

UAP User Agent Wireless Telephony Profile

UAX Unreal Tournament 2003 Sound (Epic Games, Inc.)

UAX Unreal Audio File (Epic Games, Inc.)

UAX Harry Potter

UAX Deus Ex

UAX Unified Application eXchange Format (UAX Project)

UAX Rune

UAX Undying

UAX Unreal / Unreal 2

UB Raw Unsigned Byte (8-bit) Data

UB Audio

UBB BASIC UBAS File

UBD BASIC UBAS File

UBK Embiid Reader eBook (Embiid Inc.)

UBK National Construction Estimator 32 User Costbook

UBM Iphoto Mtwain Install File

UBS Tracesrv Bugslayer Utility File

UC AutoCut Flash Firmware File (Autometrix)

UC Unreal Tournament Code File (Epic Games, Inc.)

UC2 UltraCompressor II Compressed Archive (AIPNL)

UCD Prosa/ OM Use Case Diagram

UCE UniCode Extensions

UCF Xilinx Foundation User Constraint File

UCG ULEAD MediaStudio CG Infinity Graphic (Ulead Systems, Inc.)

UCM Urban Chaos Game File

UCN U-Act Configurator Configuration Storage File (Unisys)

UCN Compressed Archive

UCR MicroSim PCBoard Unrouted Nets Report

UCS Homeworld Localized Unicode Strings (Sierra Entertainment, Inc.)

UCS Universal Classification Standard Database File

UCX Rational XDE (IBM)

UD OmniPage User Dictionary (ScanSoft, Inc.)

UD AOL 4.0 (America Online, Inc.)

UDB Works File (Microsoft)

UDB PINO 3-Server File

UDB Windows2000 Uniqueness Database File (Microsoft)

UDC Fh5 US English File

UDC Acrobat Spelling File (Adobe)

UDC Systems Management Server (SMS) Collection Evaluator Updates Collection (Microsoft Corporation)

UDD OllyDbg Module Information (Oleh Yuschuk)

UDF Excel User Defined Function (Microsoft)

UDF Photostyler Image Filter

UDF Windows NT Uniqueness Database File

UDF X-ray Diffraction Data File Format

UDI Corel Graphics Ver 10 Draw Script Textures Bitmap File (Corel)

UDL Data Link (Microsoft)

UDM MapView User-Defined Module (MotCreations)

UDS Sierra Generations Geneology Family File (Sierra Entertainment, Inc.)

UDS FIMware Database (Uniform Data System for Medical Rehabilitation, a division of UB Foundation Activities, Inc.)

UDW Raw Unsigned DoubleWord (32-bit) Data

UE2 Encrypted Archive

UEF Unified Emulator Format

UEZ COOL 3D (Ulead Systems, Inc.)

UFA UFA Compressed File Archive

UFA GIF Animator Animation Object Information (Ulead)

UFF DataWave Physiological Data File

UFO PhotoImpact Graphic (Ulead Systems, Inc.)

UFO Total Annihilation Third-party Unit (Cavedog Entertainment)

UG Drawing File

UGA Ulead GIF Animator Project File (Ulead)

UH Age of Kings (Microsoft)

UHA UHARC Compressed Archive

UHS Universal Hint System File (Universal Hint System)

UHTM Unreal Tournament File

UI User Interface

UI Geoworks UI Compiler Espire Source

UID IBM Voice Type Users File (IBM)

UIF WordPerfect Long Prompts (Corel Corporation)

UIH Geoworks UI Compiler Espire Header

UIL X-Motif UIL Table

UIN ICQ 2001+ Saved ICQ Contact Information (ICQ Inc.)

UIS WindowBlinds Skin

UKA UKA Data Archive (HRM Systems AG, CH-Winterthur)

UKA Fifa World Cup Game Data fe Art Legalscr File

UKS Works File (Microsoft)

UKX Unreal Tournament 2003 Animation (Epic Games, Inc.)

UK_ Mcguiness File

UL uLAW Audio File

ULD Procomm Uploaded Files

ULF Uniware Layout File (Uniware)

ULP EAGLE Layout Editor Script (CadSoft Computer GmbH)

ULP Peugeot Diag 2000 File

ULS Internet Location Service

ULT UltraTracker Music Module

ULW ULAW - Sun/NeXT

ULX Glulx Game

ULX CLAN Lexical File (Child Language Data Exchange System)

UM The Land Of UM World File

UMB MemMaker Backup Archive

UMD UMD Photobook

UMI CDDB Database and PC Music Library in PlayCenter

UML Visual UML Class Diagram & Model (Visual Object Modelers, Inc.)

UMOD Unreal Self-extracting MOD File (Epic Games)

UMOD Unreal Tournament (Epic Games, Inc.)

UMS Rune

UMX Unreal Tournament 2003 Music (Epic Games, Inc.)

UMX Deus Ex

UMX Harry Potter

UMX Unreal

UMX Unreal/Unreal Tournament Music File (Epic Games, Inc.)

UND A86 Assembler Undefined Symbols

UNF Btreive Unformatted File

UNI Forcast Pro Data File

UNI MikMod (UniMod) Format

UNIX UNIX File

UNL Informix Binary File Created by UNLOAD Command

UNM XMap Flight Plan or Flight Plan Statistic File (Delorme)

UNQ ACT! Saved Unknown Attachment (Best Software CRM Division)

UNQ Fax View File

UNR Unreal Map File

UNT AutoCAD Unit Definition (Autodesk, Inc.)

UNUSED Photoline4 Defaults File

UNV BusinessObjects/WebIntelligence Universe File

UNV SDRC I-DEAS File

UNV Forecast Pro Univariate Forecast File (Business Forecast Systems, Inc.)

UNX Text File

UN_ Ntgraph Setup30 file

UOL PhotoImpact Object Library File

UP2 Cool3d Plug-ins Board File

UPC Ultimate Paint (J-T-L Development Inc.)

UPD Updated Program Data

UPD VideoStudio Scene Information (Ulead Systems, Inc.)

UPD ProUpdater Per/Directory Options Setting File

UPD dBASE Update File

UPD Universal Print Driver

UPDATE Program or Data File Update

UPDATE ISAPI Loader New ISAPI Application (EGGcentric)

UPDF UltraPdf Publication (Software995)

UPF Nokia Phone Digital Photo (Nokia)

UPF Universal Picture Format Bitmap

UPG Firmware Upgrade File

UPG Grafik Anim File

UPI Iphoto4 Programs Plug-in File

UPI ULead Photo Impact Program File

UPJ ULead Project File

UPL Starmoney Agent Download File

UPM PenMail Document (UC-Logic Technology Corp.)

UPO dBASE Compiled Update File

UPR FileMaker User Spelling Dictionary

UPS Works File (Microsoft)

UPT Connectivity Memory Model Update Timing Input File

UPX ULead Photo Express Saved Image File

UPZ Starmoney Agent Download File

URF AppFace Skin (Matinsoft Inc.)

URF Radar ViewPoint Universal Radar Format

URF ProWORX Nxt User Configurable Register Editor File (Schneider Electric)

URI List of Uniform Resource Identifiers

URIS List of Uniform Resource Identifiers

URL Internet Location

URLS GetRight URL List (Headlight Software, Inc.)

URS ControlDraw User Requirements Specifier (ControlDraw Ltd.)

URT Utah Raster Image

USA Office Header File (Microsoft)

USA Unreal Saved Game File

USAGE Snort File

USB USB Protocol Analyzer Trace

USB Syssoft Sandra File

USB D-Link FM Radio Update

USE MKS Source Integrity File

USE Log File

USERPROFILE Live Update User Profile (Symantec)

USF Core Media Player XML Universal Subtitle Format File (CoreCodec, Inc.)

USF Nintendo Ultra 64 Sound Format

USI UsiXML UI Description File (Universite Catholique de Louvain-la-Neuve)

USL PC-Bibliothek User Dictionary (Bibliographisches Institut & F.A. Brockhaus AG)

USL LaserJet Landscape Font

USL ProWORX Nxt USL Loadables (Schneider Electric)

USP LaserJet Portrait Font

USP SIMCA-P/SIMCA-P+ Project (Umetrics AB)

USP PageMaker Printer Font (Adobe)

USR Pegasus Mail User Information (David Harris)

USR Uplink Player Information File (Introversion Software)

USR MicroImages User-specific Information (MicroImages, Inc.)

USR Photo Paint User Defined Filter (Corel)

USR ERGO Receiver Configuration File (Creative Express Corporation)

USR User Database

USR FileMaker Pro Runtime Engine Database Application (FileMaker, Inc.)

USS PhotoImpact Exported Slicing Pattern (Ulead Systems, Inc.)

USS WinUAE Saved State

USTAR POSIX tar Compressed Archive

USX Unreal Tournament 2003 Static Mesh (Epic Games, Inc.)

USZ UsiXML UI Description File (Universite Catholique de Louvain-la-Neuve)

UT! µTorrent Incomplete Download (Ludvig Strigeus)

UT2 Unreal Tournament Map (Epic Games, Inc.)

UT2MOD Unreal Tournament 2003 Game Modification File (Epic Games)

UT4MOD Unreal Tournament 2004 MOD Installation Package (Epic Games)

UTE Rukus 110 File

UTF AOL Updating Files (America Online, Inc.)

UTI Spybot - Search & Destroy Usage Tracking (PepiMK Software)

UTL Sound File

UTL QuickBooks Data

UTP BinPatch Patch Data File

UTS Spybot - Search & Destroy Include File (PepiMK Software)

UTX Unreal Tournament 2003 Texture (Epic Games, Inc.)

UTX Unicode File

UTX Unreal / Unreal 2

UTX Harry Potter

UTX Deus Ex

UTX Rune

UTX Undying

UU Compressed Archive File

UUD Uudecoded

UUE Uuencoded

UUT Genesis 2000 (Genesis 2000, Inc.)

UV EA Games Video File (Electronic Arts, Inc.)

UV2 Jane's Combat Simulations F-15

UVP ULEAD MediaStudio Video Paint Graphic (Ulead Systems, Inc.)

UVR Ulead Cool 360 Viewer File

UVV Listlabl File

UVW geoManager/geoInterface User View

UVX Unreal Tournament 2003 Saved Game (Epic Games, Inc.)

UW Raw Unsigned Word (16-bit) Data

UW Unitype GlobalWriter File

UW Audio

UWF UltraTracker Wave File

UWL WordPerfect User Word List (Corel Corporation)

UWS UniTrader 2006 Website Archive (UniTechnology Limited)

UWT UniTrader Template Archive (UniTechnology Ltd.)

UX UNIX File

UXD URLBase URL Database (Terria Development)

UXP URLBase URL Database (v. 5.1) (Terria Development)

UXX Unreal Tournament 2003 Cache (Epic Games, Inc.)

UXY Orchida Embroidery System (Orchida Soft)

UYVY ImageMagick Ver. 5.3.2 Perlmagick File (ImageMagick Studio LLC)

UYVY Interleaved YUV Raw Image

UZ Unreal Tournament Server File

UZE Ultimate Zip Compresion Agent

UZR UZR 3D Streamable 3D File Format

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