Alphabetic File Extension List

The file extension list you requested is shown on this page. It loads as a table so please give it a moment as some of the lists are quite long. These lists contain basic information: the extension, the name of the program it works with, the specific function of the file, and the company that makes the program. Not all extensions have all of the data. Click on the extension of interest to see the detail page for that extension. Total extensions in this particular list: 332.

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Extension Information
U Subsampled Raw YUV Bitmap
U Unreal System File
U Unreal Tournament 2003 System File (Epic Games, Inc.)
U Nitpicker Ipflow File
U Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
U2 Telelogic Tau UML Model
U2E Unreal Game Translation
U2P Telelogic Tau UML Program Text File
U3D Universal 3D File
U3D Ultimate3D Engine 3D Engine (Ultimate3D)
U3I Sandisk Launchpad Application Installer file (SanDisk Corporation)
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
UAS PhotoImpact Backup/Recovery File (Ulead Systems, Inc.)
UAX Unreal Audio File (Epic Games, Inc.)
UAX Unreal Tournament 2003 Sound (Epic Games, Inc.)
UAX Deus Ex
UAX Harry Potter
UAX Rune
UAX Undying
UAX Unreal / Unreal 2
UAX Unified Application eXchange Format (UAX Project)
UB Audio
UB Raw Unsigned Byte (8-bit) Data
UBB BASIC UBAS File
UBD BASIC UBAS File
UBK National Construction Estimator 32 User Costbook
UBK Embiid Reader eBook (Embiid Inc.)
UBM Iphoto Mtwain Install File
UBS Tracesrv Bugslayer Utility File
UC Unreal Tournament Code File (Epic Games, Inc.)
UC AutoCut Flash Firmware File (Autometrix)
UC2 UltraCompressor II Compressed Archive (AIPNL)
UCC National UCC Financing Statement Software Uniform Commercial Code Form (National LawForms, Inc.)
UCD Prosa/ OM Use Case Diagram
UCE UniCode Extensions
UCF Xilinx Foundation User Constraint File
UCF Epson Personal Settings Information (Epson Corporation)
UCG ULEAD MediaStudio CG Infinity Graphic (Corel Corporation)
UCI Samsung YP-P2 Theme
UCM Urban Chaos Game File
UCMN Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UCN Compressed Archive
UCN U-Act Configurator Configuration Storage File (Unisys)
UCR MicroSim PCBoard Unrouted Nets Report
UCS Universal Classification Standard Database File
UCS Homeworld Localized Unicode Strings (Sierra Entertainment, Inc.)
UCSETTINGS Universal Converter Configuration File (Anthony R. Daly)
UCV Universal Converter Conversion File (Anthony R. Daly)
UCX Rational XDE (IBM)
UD AOL 4.0 (America Online, Inc.)
UD OmniPage User Dictionary (Nuance Communications, Inc.)
UDB Works File (Microsoft Corporation)
UDB PINO 3-Server File
UDB Windows2000 Uniqueness Database File (Microsoft Corporation)
UDB VBA32 Antivirus Signature File (VirusBlokAda Ltd.)
UDC Acrobat Spelling File (Adobe Systems Incorporated)
UDC Fh5 US English File
UDC Systems Management Server (SMS) Collection Evaluator Updates Collection (Microsoft Corporation)
UDD OllyDbg Module Information (Oleh Yuschuk)
UDF Excel User Defined Function (Microsoft Corporation)
UDF Photostyler Image Filter
UDF Windows NT Uniqueness Database File
UDF X-ray Diffraction Data File Format
UDF Uyap Dokuman Editoru Document (Türkiye Barolar Birliği)
UDI Dazzle DVD Complete (Pinnacle Systems, Inc.)
UDI Corel Graphics Ver 10 Draw Script Textures Bitmap File (Corel)
UDL Data Link (Microsoft Corporation)
UDL ADONIS User Export From Database (BOC Group)
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.)
UDS NHTSA UDS-1992 Crash Test Data
UDW Raw Unsigned DoubleWord (32-bit) Data
UE2 Encrypted Archive
UEED Uconomix Encryption Engine Encrypted Directory (Uconomix Technologies Pvt Ltd)
UEEF Uconomix Encryption Engine Encrypted File (Uconomix Technologies Pvt Ltd)
UEF Unified Emulator Format
UENC UltraEdit Encrypted File (IDM Computer Solutions, Inc.)
UEZ COOL 3D (Ulead Systems, Inc.)
UFA UFA Compressed File Archive
UFA GIF Animator Animation Object Information (Ulead)
UFD PDP-10 User File Directory
UFF DataWave Physiological Data File
UFI UFOCaptureV2 Presets (SonotaCo)
UFO Ellisys Visual USB Data (Ellisys)
UFO PhotoImpact Graphic (Ulead Systems, Inc.)
UFO Total Annihilation Third-party Unit (Cavedog Entertainment)
UFSD UFS Explorer Professional Recovery RAW Recovery Signatures Database (SysDevSoftware)
UG Drawing File
UGA Ulead GIF Animator Project File (Corel Corporation)
UH Age of Kings (Microsoft Corporation)
UHA UHARC Compressed Archive
UHS Universal Hint System File (Universal Hint System)
UHTM Unreal Tournament File
UI Qt User Interface (Qt Software)
UI Geoworks UI Compiler Espire Source
UI User Interface
UID IBM Voice Type Users File (IBM)
UIF WordPerfect Long Prompts (Corel Corporation)
UIF Magic ISO Universal Image Format File (MagicISO Inc.)
UIH Geoworks UI Compiler Espire Header
UIL X-Motif UIL Table
UIN ICQ 2001+ Saved ICQ Contact Information (ICQ Inc.)
uindex Newsgroup Index File
UIR LabWindows User Interface Resource (National Instruments Corporation)
UIS WindowBlinds Skin
UKA Fifa World Cup Game Data fe Art Legalscr File
UKA UKA Data Archive (HRM Systems AG, CH-Winterthur)
UKS Works File (Microsoft Corporation)
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 Peugeot Diag 2000 File
ULP EAGLE Layout Editor Script (CadSoft Computer GmbH)
ULS Internet Location Service
ULT UltraTracker Music Module
ULW ULAW - Sun/NeXT
ULX Glulx Game
ULX CLAN Lexical File (Child Language Data Exchange System)
ULZ USBlyzer (USBlyzer)
UM The Land Of UM World File
UM Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
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.)
UMP UModel Project (Altova)
UMR MyEclipse UML Model Repository (Genuitec, LLC.)
UMS Rune
UMX Unreal/Unreal Tournament Music File (Epic Games, Inc.)
UMX Unreal Tournament 2003 Music (Epic Games, Inc.)
UMX Deus Ex
UMX Harry Potter
UMX U-MYX Player Song Mix Data and Timing Info (U-MYX Ltd.)
UNASSIGNED Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UNC Files and Settings Transfer Wizard Output Folder (Microsoft Corporation)
UNCIAL Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UND A86 Assembler Undefined Symbols
UNF Btreive Unformatted File
UNI Forcast Pro Data File
UNI MikMod (UniMod) Format
UNIKEY Unikey Software Protection Solution (SecuTech Solution Inc.)
UNION Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UNIVERSAL3 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UNIX UNIX File
UNIX Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UNKNOWN [None]
UNL Informix Binary File Created by UNLOAD Command
UNLOCK Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UNM XMap Flight Plan or Flight Plan Statistic File (Delorme)
UNPAC Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UNPACK Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UNQ ACT! Saved Unknown Attachment (Best Software CRM Division)
UNQ Fax View File
UNR Unreal Map File
UNS Visual Navigation Suite Export/Import Settings (Jeppesen Marine, Inc.)
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
UNX Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UN_ Ntgraph Setup30 file
UOF Uniform Office Format
UOL PhotoImpact Object Library File
UP Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UP2 Cool3d Plug-ins Board File
UPC Ultimate Paint (J-T-L Development Inc.)
UPCASE Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UPD dBASE Update File
UPD ProUpdater Per/Directory Options Setting File
UPD Universal Print Driver
UPD Updated Program Data
UPD VideoStudio Scene Information (Ulead Systems, Inc.)
UPD Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UPD Ulead Private Data (Corel Corporation)
UPDATE ISAPI Loader New ISAPI Application (EGGcentric)
UPDATE Program or Data File Update
UPDATE Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UPDATEALL Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UPDATEINFO Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UPDATES Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UPDF UltraPdf Publication (Software995)
UPF Nokia Phone Digital Photo (Nokia)
UPF Universal Picture Format Bitmap
UPG Grafik Anim File
UPG Firmware Upgrade File
UPI Iphoto4 Programs Plug-in File
UPI ULead Photo Impact Program File (Corel Corporation)
UPJ ULead Project File (Corel Corporation)
UPK Mass Effect Game File Archive (EA International (Studio and Publishing) Ltd.)
UPL Starmoney Agent Download File
UPL Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UPM PenMail Document (UC-Logic Technology Corp.)
UPO dBASE Compiled Update File
UPP Uniprint Unified Printer Parameter
UPR FileMaker User Spelling Dictionary
UPS Works File (Microsoft Corporation)
UPT Connectivity Memory Model Update Timing Input File
UPX ULead Photo Express Saved Image File (Corel Corporation)
UPZ Starmoney Agent Download File
UQM The Ur-Quan Masters Archive (The Ur-Quan Masters Team)
URBS Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
URD Ultra Recall Database (Kinook Software, Inc.)
URD-JOURNAL Ultra Recall Journal Update File (Kinook Software, Inc.)
URF ProWORX Nxt User Configurable Register Editor File (Schneider Electric)
URF Radar ViewPoint Universal Radar Format
URF AppFace Skin (Matinsoft Inc.)
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
US Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
USA Office Header File (Microsoft Corporation)
USA Unreal Saved Game File
USAGE Snort File
USAGE Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
USB D-Link FM Radio Update
USB Syssoft Sandra File
USB USB Protocol Analyzer Trace
USD Epson PRINT Image Framer (PIF) Framer File (Seiko Epson Corp.)
USE Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
USE Log File
USE MKS Source Integrity File
USER Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
USERPROFILE Live Update User Profile (Symantec Corporation)
USF Core Media Player XML Universal Subtitle Format File (CoreCodec, Inc.)
USF Nintendo Ultra 64 Sound Format (Nintendo)
USI UsiXML UI Description File (Universite Catholique de Louvain-la-Neuve)
USI Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
USK Ultraplayer Ultraplayer Playlist File (UltraCo, Inc)
USL LaserJet Landscape Font
USL ProWORX Nxt USL Loadables (Schneider Electric)
USL PC-Bibliothek User Dictionary (Bibliographisches Institut & F.A. Brockhaus AG)
USP LaserJet Portrait Font
USP PageMaker Printer Font (Adobe Systems Incorporated)
USP SIMCA-P/SIMCA-P+ Project (Umetrics AB)
USR User Database
USR ERGO Receiver Configuration File (Creative Express Corporation)
USR MicroImages User-specific Information (MicroImages, Inc.)
USR Uplink Player Information File (Introversion Software)
USR Photo Paint User Defined Filter (Corel)
USR Pegasus Mail User Information (David Harris)
USR FileMaker Pro Runtime Engine Database Application (FileMaker, Inc.)
USR Daqarta Extended Audio Data (Interstellar Research)
USR Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
USS PhotoImpact Exported Slicing Pattern (Ulead Systems, Inc.)
USS WinUAE Saved State
UST WiFi SiStr Exported User Theme (DNsoft.be)
USTAR POSIX tar Compressed Archive
USX Unreal Tournament 2003 Static Mesh (Epic Games, Inc.)
USYM Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
USZ UsiXML UI Description File (Universite Catholique de Louvain-la-Neuve)
UT2 Unreal Tournament Map (Epic Games, Inc.)
UT2MOD Unreal Tournament 2003 Game Modification File (Epic Games)
UT3 Unreal Tournament 3 Map (Epic Games, Inc.)
UT4MOD Unreal Tournament 2004 MOD Installation Package (Epic Games)
UTC BioWare Aurora Engine Creature (BioWare Corp.)
UTD BioWare Aurora Engine Doors (BioWare Corp.)
UTE BioWare Aurora Engine Encounter (BioWare Corp.)
UTE Rukus 110 File
UTF AOL Updating Files (America Online, Inc.)
UTI Spybot - Search & Destroy Usage Tracking (PepiMK Software)
UTI BioWare Aurora Engine Item (BioWare Corp.)
UTI SafeGuard PrivateCrypto Encrypted Archive (Utimaco Safeware AG)
UTIL Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UTIL2 Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UTILITIES Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UTILITY Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UTILS Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UTL QuickBooks Data (Intuit Inc.)
UTL Sound File
UTM BioWare Aurora Engine Store (BioWare Corp.)
UTMP Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UTP BioWare Aurora Engine Placeable Object (BioWare Corp.)
UTP BinPatch Patch Data File
UTS Spybot - Search & Destroy Include File (PepiMK Software)
UTS BioWare Aurora Engine Sound (BioWare Corp.)
UTT BioWare Aurora Engine Trigger (BioWare Corp.)
UTW BioWare Aurora Engine Waypoint (BioWare Corp.)
UTX Unicode File
UTX Unreal Tournament 2003 (or UT 99) Texture (Epic Games, Inc.)
UTX Deus Ex
UTX Harry Potter
UTX Rune
UTX Undying
UTXT Various Programs Unicode Text File
UU Compressed Archive File
UUCP Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
UUD Uudecoded
UUE Uuencoded
UUE Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
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 (Corel Corporation)
UVR Ulead Cool 360 Viewer File (Corel Corporation)
UVV Listlabl File
UVW geoManager/geoInterface User View
UVX Unreal Tournament 2003 Saved Game (Epic Games, Inc.)
UW Audio
UW Raw Unsigned Word (16-bit) Data
UW Unitype GlobalWriter File
UWF UltraTracker Wave File
UWL WordPerfect User Word List (Corel Corporation)
UWL GroupWise User Word List (Novell, Inc.)
UWS UniTrader 2006 Website Archive (UniTechnology Limited)
UWT UniTrader Template Archive (UniTechnology Ltd.)
UX UNIX File
UXD URLBase URL Database (Terria Development)
UXF UMLet UML eXchange Format (UMLet Team)
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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