File Extension U - Subsampled Raw YUV Bitmap , etc
File Extension U2 - Telelogic Tau UML Model , etc
File Extension U2E - Unreal Game Translation , etc
File Extension U2P - Telelogic Tau UML Program Text File , etc
File Extension U3D - Universal 3D File , etc
File Extension U3P - U3 Platform Install File (U3 LLC.), etc
File Extension U4A - UnInstaller Archive , etc
File Extension U8 - Raw Unsigned 8-Bit Audio Data , etc
File Extension U96 - EasyZip Temporary File , etc
File Extension U98 - Urdu 98 Document , etc
File Extension UAE - WinUAE 0.8.22 Game Configuration File , etc
File Extension UAP - User Agent Wireless Telephony Profile , etc
File Extension UAS - PhotoImpact Backup/Recovery File (Ulead Systems, Inc.), etc
File Extension UAX - Unreal Tournament 2003 Sound (Epic Games, Inc.), etc
File Extension UB - Raw Unsigned Byte (8-bit) Data , etc
File Extension UBB - BASIC UBAS File , etc
File Extension UBD - BASIC UBAS File , etc
File Extension UBK - Embiid Reader eBook (Embiid Inc.), etc
File Extension UBM - Iphoto Mtwain Install File , etc
File Extension UBS - Tracesrv Bugslayer Utility File , etc
File Extension UC - AutoCut Flash Firmware File (Autometrix), etc
File Extension UC2 - UltraCompressor II Compressed Archive (AIPNL), etc
File Extension UCD - Prosa/ OM Use Case Diagram , etc
File Extension UCE - UniCode Extensions , etc
File Extension UCF - Xilinx Foundation User Constraint File , etc
File Extension UCG - ULEAD MediaStudio CG Infinity Graphic (Corel Corporation), etc
File Extension UCI - Samsung YP-P2 Theme , etc
File Extension UCM - Urban Chaos Game File , etc
File Extension UCMN - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension UCN - Compressed Archive , etc
File Extension UCR - MicroSim PCBoard Unrouted Nets Report , etc
File Extension UCS - Universal Classification Standard Database File , etc
File Extension UCX - Rational XDE (IBM), etc
File Extension UD - OmniPage User Dictionary (Nuance Communications, Inc.), etc
File Extension UDB - Windows2000 Uniqueness Database File (Microsoft Corporation), etc
File Extension UDC - Systems Management Server (SMS) Collection Evaluator Updates Collection (Microsoft Corporation), etc
File Extension UDD - OllyDbg Module Information (Oleh Yuschuk), etc
File Extension UDF - X-ray Diffraction Data File Format , etc
File Extension UDI - Dazzle DVD Complete (Pinnacle Systems, Inc.), etc
File Extension UDL - Data Link (Microsoft Corporation), etc
File Extension UDM - MapView User-Defined Module (MotCreations), etc
File Extension UDS - Sierra Generations Geneology Family File (Sierra Entertainment, Inc.), etc
File Extension UDW - Raw Unsigned DoubleWord (32-bit) Data , etc
File Extension UE2 - Encrypted Archive , etc
File Extension UEED - Uconomix Encryption Engine Encrypted Directory (Uconomix Technologies Pvt Ltd), etc
File Extension UEEF - Uconomix Encryption Engine Encrypted File (Uconomix Technologies Pvt Ltd), etc
File Extension UEF - Unified Emulator Format , etc
File Extension UENC - UltraEdit Encrypted File (IDM Computer Solutions, Inc.), etc
File Extension UEZ - COOL 3D (Ulead Systems, Inc.), etc
File Extension UFA - UFA Compressed File Archive , etc
File Extension UFD - PDP-10 User File Directory , etc
File Extension UFF - DataWave Physiological Data File , etc
File Extension UFI - UFOCaptureV2 Presets (SonotaCo), etc
File Extension UFO - PhotoImpact Graphic (Ulead Systems, Inc.), etc
File Extension UFSD - UFS Explorer Professional Recovery RAW Recovery Signatures Database (SysDevSoftware), etc
File Extension UG - Drawing File , etc
File Extension UGA - Ulead GIF Animator Project File (Corel Corporation), etc
File Extension UH - Age of Kings (Microsoft Corporation), etc
File Extension UHA - UHARC Compressed Archive , etc
File Extension UHS - Universal Hint System File (Universal Hint System), etc
File Extension UHTM - Unreal Tournament File , etc
File Extension UI - Qt User Interface (Trolltech ASA), etc
File Extension UID - IBM Voice Type Users File (IBM), etc
File Extension UIF - Magic ISO Universal Image Format File (MagicISO Inc.), etc
File Extension UIH - Geoworks UI Compiler Espire Header , etc
File Extension UIL - X-Motif UIL Table , etc
File Extension UIN - ICQ 2001+ Saved ICQ Contact Information (ICQ Inc.), etc
File Extension UIR - LabWindows User Interface Resource (National Instruments Corporation), etc
File Extension UIS - WindowBlinds Skin , etc
File Extension UKA - UKA Data Archive (HRM Systems AG, CH-Winterthur), etc
File Extension UKS - Works File (Microsoft Corporation), etc
File Extension UKX - Unreal Tournament 2003 Animation (Epic Games, Inc.), etc
File Extension UK_ - Mcguiness File , etc
File Extension UL - uLAW Audio File , etc
File Extension ULD - Procomm Uploaded Files , etc
File Extension ULF - Uniware Layout File (Uniware), etc
File Extension ULP - Peugeot Diag 2000 File , etc
File Extension ULS - Internet Location Service , etc
File Extension ULT - UltraTracker Music Module , etc
File Extension ULW - ULAW - Sun/NeXT , etc
File Extension ULX - Glulx Game , etc
File Extension UM - The Land Of UM World File , etc
File Extension UMB - MemMaker Backup Archive , etc
File Extension UMD - UMD Photobook , etc
File Extension UMI - CDDB Database and PC Music Library in PlayCenter , etc
File Extension UML - Visual UML Class Diagram & Model (Visual Object Modelers, Inc.), etc
File Extension UMOD - Unreal Tournament (Epic Games, Inc.), etc
File Extension UMP - UModel Project (Altova), etc
File Extension UMR - MyEclipse UML Model Repository (Genuitec, LLC.), etc
File Extension UMS - Rune , etc
File Extension UMX - Harry Potter , etc
File Extension UNASSI - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension UNCIAL - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension UND - A86 Assembler Undefined Symbols , etc
File Extension UNF - Btreive Unformatted File , etc
File Extension UNI - MikMod (UniMod) Format , etc
File Extension UNIKEY - Unikey Software Protection Solution (SecuTech Solution Inc.), etc
File Extension UNION - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension UNIVER - Unknown Apple II File (found on Golden Orchard Apple II CD Rom) , etc
File Extension UNIX - UNIX File , etc