.??_ 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
.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
.UB Audio File
Raw Unsigned Byte (8-bit) Data
.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
.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)
.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
.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
.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
.UPX ULead Photo Express Saved Image File
.URF Radar ViewPoint Universal Radar Format
.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
.USL LaserJet Landscape Font
.USP PageMaker Printer Font
LaserJet Portrait Font
.USR User Database (various)
.UTF AOL Updating Files (found in TOD [Tools on Demand] folder)
.UTL Sound File
.UTP BinPatch Patch Data File
.UTX Unreal Texture File
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
.UW Audio File
Raw Unsigned Word (16-bit) Data
Unitype GlobalWriter File
.UWF UltraTracker Wave File
.UWL WordPerfect User Word List
.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
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