UDS - UNH
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- UDS - FIMware Database
- UDS - Sierra Generations Geneology Family File ( Sierra Entertainment Inc.)
- UDS - NHTSA UDS- 1992 crash test results Header
- UDS - Uniform Data System file
- UDS - NHTSA UDS- 1992 crash test data file
- UDS - Sierra Generations File
- UDW - Raw unsigned doubleword (32-bit) data
- UE2 - Encrypted archive (UltraCompressor II)
- UEA - Protector Suite QL file
- UEED - Uconomix Encryption Engine Encrypted Directory ( Uconomix Technologie...
- UEEF - Uconomix Encryption Engine Encrypted File ( Uconomix Technologies Pvt...
- UEF - Unified Emulator Format
- UENC - UltraEdit Encrypted File (IDM Computer Solutions Inc.)
- UEZ - COOL 3D ( Ulead Systems Inc.)
- UFA - GIF Animator Animation Object Information ( Ulead )
- UFA - UFA Compressed File Archive
- UFA - UFA compressed archive Header
- UFD - PDP-10 User File Directory
- UFI - data - UFO CaptureV2 settings
- UFI - UFOCaptureV2 Preset settings Header
- UFM - Unicode TrueType font
- UFO - Object file (Ulead)
- UFP - Ulead photo project file
- UFS - FreeBSD PC-BSD Unix File System file
- UFSD - UFS Explorer Professional Recovery RAW Recovery Signatures Database (...
- UG - Drawing file (AutoCAD and others)
- UGA - Ulead GIF Animator Project File ( Corel Corporation )
- UGBT - Mac File Type
- UH - Age Of Empires - Age of Kings
- UHA - UHARC compressed archive Header
- UHA - UHarc Compressed Archive
- UHA - Compressed Multimedia Archive ( UHarc ) File
- UHS - Binary file (Universal Hint System)
- UHTM - Unreal Tournament File
- UI - User interface file (Sprint)
- UI - Espire source code (Geoworks UI Compiler)
- UIBAK - UltraISO Backup Disk Image
- UID - IBM Voice Type Users File (IBM)
- UIF - Long prompts for Microsoft Windows (WordPerfect for Windows)
- UIFILE - Windows Explorer UIFILE Header
- UIH - Espire header file (Geoworks UI Compiler)
- UIL - Bitmap image (X- Motif UIL icon file )
- UIL - X- Motif UIL Table
- UIN - ICQ user
- UIN - ICQ (a variety of instant messaging ) user
- UINDEX - Newsgroup Index File
- UIR - LabWindows User Interface Resource Header
- UIR - LabWindows User Interface Resource ( National Instruments Corporation )
- UIS - WindowBlinds User Interface Specification
- UIS - Skin File
- UIS - WindowBlinds Skin
- UK - English language translation file
- UK - TAGCASE0 html folder file
- UKA - Fifa World Cup Game Data fe Art Legalscr File
- UKA - UKA Data Archive (HRM Systems AG CH- Winterthur )
- UKS - Works File ( Microsoft Corporation )
- UKS - Microsoft Works File
- UKX - Unreal Animation Package
- UKX - Unreal Tournament animation file
- UL - Audio file (ULAW)
- ULAW - (CCITT G.711) audio (US Telephony)
- ULB - COBOL Unisys Library file
- ULD - Uploaded file information (Procomm Plus)
- ULF - Universal List File
- ULF - Uniware Layout File ( Uniware )
- ULF - data - MRF Mapping Tool Kit Universal List Format
- ULP - EAGLE Layout Editor Script ( CadSoft Computer GmbH )
- ULP - Peugeot Diag 2000 File
- ULS - Internet Location Service
- ULS - NetMeeting user location service file
- ULT - Music module (MOD) (UltraTracker)
- ULW - Raw & micro -Law Audio File
- ULW - u-Law Audio File
- ULX - Glulx data file
- ULX - CLAN Lexical File ( Child Language Data Exchange System )
- ULZ - USBlyzer ( USBlyzer )
- ULZ - USBlyzer Data Capture File
- UM - The Land Of UM World File
- UMB - Backup file (archive) (MemMaker)
- UMD - UMD Photobook
- UML - Visual UML Class Diagram & Model ( Visual Object Modelers Inc.)
- UMOD - Unreal Self - extracting MOD File ( Epic Games )
- UMOD - Unreal Self - extracting MOD File
- UMOD - Unreal Tournament Module File
- UMP - UModel Project ( Altova )
- UMR - MyEclipse UML Model Repository ( Genuitec LLC.)
- UMS - Rune
- UMX - Unreal Music Package
- UMX - U-MYX Player song mix data
- UMX - Harry Potter
- UMX - Unreal Tournament music
- UMX - Deus Ex file
- UN_ - Ntgraph Setup30 file
- UNAUTH - SiteMinder Unauthorized Message File
- UNC - Files and Settings Transfer Wizard Output Folder (Note: folder format)
- UND - A86 Assembler Undefined Symbols
- UND - A86 UNDefined symbols
- UNF - Btreive Unformatted File
- UNF - Universal NES Image Interchange File Format

