A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Num Sym
.??_ Files ending in "_" are often compressed install files of the same name (e.g., .EX_ expands to .EXE, .DL_ expands to .DLL, etc.) .U Unreal System File Unreal Tournament 2003 System File .U2 Telelogic Tau UML Model .U2E Unreal Game Translation .U2P Telelogic Tau UML Program Text File .U8 Raw Unsigned 8-Bit Audio Data .U96 EasyZip Temporary File .U98 Urdu 98 Document (Urdu text) .UAP User Agent Wireless Telephony Profile .UAX Unreal Audio File Unreal Tournament 2003 Sound .UB Audio File Raw Unsigned Byte (8-bit) Data .UBK National Construction Estimator 32 User Costbook .UC Unreal Tournament Code File .UC2 Compressed File .UCF Xilinx Foundation User Constraint File .UCM Urban Chaos Game File .UCN Compressed Archive .UCR MicroSim PCBoard Unrouted Nets Report .UCS Universal Classification Standard Database File .UDB PINO 3-Server File Win2000 Uniqueness Database File (used in setup--provides answers that override defaults for unattended installs) .UDC Acrobat Spelling File .UDF Microsoft Excel User Defined Function Photostyler Image Filter .UDL Microsoft Data Link .UDS Sierra Generations Family File (program no longer supported) .UDW Raw Unsigned DoubleWord (32-bit) Data .UE2 Encrypted Archive .UEZ Ulead COOL 3D .UFF DataWave Physiological Data File .UFO Ulead Object File .UG Drawing File (various) .UH Microsoft Age of Kings File .UHA UHARC Compressed Archive [Download Link] .UHS Universal Hint System File .UHTM Unreal Tournament File .UI User Interface Geoworks UI Compiler Espire Source .UIF WordPerfect Long Prompts .UIH Geoworks UI Compiler Espire Header .UIL X-Motif UIL Table .UIN ICQ 2001+ Saved ICQ Contact Information .UIS WindowBlinds Skin (changes the look and feel of WindowsXP) .UKX Unreal Tournament 2003 Animation .UL uLAW Audio File .ULD Procomm Uploaded Files .ULP Peugeot Diag 2000 File (vehicle diagnostic equipment) .ULS Internet Location Service .ULT UltraTracker Music Module .ULW ULAW - Sun/NeXT .ULX Glulx Game [Use Glulx Interpreter] .UM The Land Of UM World File .UMB MemMaker Backup Archive .UMI CDDB Database and PC Music Library in PlayCenter .UMOD Unreal Self-extracting MOD File Unreal Tournament .UMX Unreal Music File Unreal Tournament 2003 Music .UNF Btreive Unformatted File .UNI MikMod (UniMod) Format Forcast Pro Data File .UNL Informix Binary File Created by UNLOAD Command .UNQ Fax View File (unverified) ACT! Saved Unknown Attachment (associated with .DET saved E-mail) .UNR Unreal Map File .UNT AutoCAD Unit Definition File .UNX Text File (usually UNIX) .UNV BusinessObjects/WebIntelligence Universe File (End-user query analysis/reporting tool) .UOL PhotoImpact Object Library File .UPD dBase Update File ProUpdater Per/Directory Options Setting File Universal Print Driver (cross-platform) Updated Program Data (various) .UPF Nokia Digital Photo .UPI ULead Photo Impact Program File [XnView] .UPJ ULead Project File .UPO dBase Compiled Update File .UPR FileMaker User Spelling Dictionary .UPT Connectivity Memory Model Update Timing Input File .UPX ULead Photo Express Saved Image File .URF Radar ViewPoint Universal Radar Format ProWORX Nxt User Configurable Register Editor File (Found in the NxT directory) .URL Internet Location .URT Utah Raster Image [XnView] .USA Unreal Saved Game File .USB D-Link FM Radio Update USB Protocol Analyzer Trace (USBChief, USBAdvisor, USBTracer) .USE MKS Source Integrity File .USERPROFILE Symantec Live Update User Profile .USF Core Media Player XML Universal Subtitle Format File .USL LaserJet Landscape Font ProWORX Nxt USL Loadables (Found in the NxT directory) .USP PageMaker Printer Font LaserJet Portrait Font .USR User Database (various) .USX Unreal Tournament 2003 Static Mesh .UT2 Unreal Tournament 2003 Map .UTF AOL Updating Files (found in TOD [Tools on Demand] folder) .UTL Sound File .UTP BinPatch Patch Data File .UTX Unreal Texture File Unreal Tournament 2003 Texture Unicode File (editor: UniPad) .UU Compressed Archive File (UUENCODE) [Tutorial] .UUD Uudecoded [Tutorial] .UUE Uuencoded [Tutorial] .UV2 Jane's Combat Simulations F-15 .UVR Ulead Cool 360 Viewer File .UVW geoManager/geoInterface User View .UVX Unreal Tournament 2003 Saved Game .UW Audio File Raw Unsigned Word (16-bit) Data Unitype GlobalWriter File .UWF UltraTracker Wave File .UWL WordPerfect User Word List .UXX Unreal Tournament 2003 Cache .UYVY Interleaved YUV Raw Image .UZ Unreal Tournament Server File (added to the normal extention of any adapted UT file) .UZE Ultimate Zip Compresion Agent .UZR UZR 3D Streamable 3D File Format