| # | Name | File Type |
|---|---|---|
| 1 | U Opener | Unreal Tournament Class Package |
| 2 | U00 Opener | The Price Is Right 2010 Game |
| 3 | U01 Opener | Barudan Embroidery |
| 4 | U08 Opener | UFile Data |
| 5 | U10 Opener | UFile 2010 Tax Return |
| 6 | U11 Opener | UFile 2011 Tax Return |
| 7 | U12 Opener | UFile 2012 Tax Return |
| 8 | U14 Opener | Embird Embroidery Software Data Format |
| 9 | U255LAW Opener | Exponential 8-bit Sound |
| 10 | U2CAR Opener | NFS:U2 Car |
| 11 | U32 Opener | Authorware Cover |
| 12 | U3D Opener | Universal 3D Format |
| 13 | U3I Opener | U3 Application Information Format |
| 14 | U3P Opener | U3 Smart Application |
| 15 | U8 Opener | 3D Lemmings Audio Format |
| 16 | U96 Opener | EasyZip Temporary |
| 17 | UAE Opener | WinUAE Configuration |
| 18 | UAL Opener | Entrust Unattended Login Credentials |
| 19 | UAP Opener | SIMATIC WinCC User Archive Export |
| 20 | UAQ Opener | Microsoft Windows Action Queue |
| 21 | UAR Opener | Uniface Deployment Archive Format |
| 22 | UAS Opener | Ulead PhotoImpact Backup |
| 23 | UASSET Opener | UnrealEd Resource Format |
| 24 | UAV Opener | OpenPilot UAV Settings |
| 25 | UAX Opener | Unreal Audio Package |
| 26 | UB Opener | Unsigned Byte Audio Format |
| 27 | UBIFS Opener | Linux UBIFS Image |
| 28 | UBJ Opener | Universal Binary JSON Format |
| 29 | UBM Opener | IPhoto Mtwain Install |
| 30 | UBOT Opener | UBot Project Format |
| 31 | UBOX Opener | Universe Sandbox Data Format |
| 32 | UBR Opener | IIS WCAT Configuration |
| 33 | UBX Opener | U-center UBX GPS Log Data Format |
| 34 | UBZ Opener | Open-Sankore Document Format |
| 35 | UC Opener | UnrealScript Class |
| 36 | UC2 Opener | UltraCompressor 2 Archive |
| 37 | UCB Opener | Unstoppable Copier Batch Scirpt Format |
| 38 | UCCAPILOG Opener | Microsoft UCC API Log Format |
| 39 | UCD Opener | Prosa Diagram |
| 40 | UCE Opener | Windows UCE System Format |
| 41 | UCF Opener | WebEx Media Format |
| 42 | UCI Opener | UFS Explorer Backup Format |
| 43 | UCL Opener | Unreal Tournament Cache Format |
| 44 | UCLS Opener | ObjectAid UML Explorer Class Diagram |
| 45 | UCM Opener | Crazy Machines Model Format |
| 46 | UCP Opener | SmartWare Communications Profile |
| 47 | UCR Opener | MicroSim PCBoard Unrouted Nets Report |
| 48 | UCS Opener | Homeworld Localized Unicode Strings |
| 49 | UCSETTINGS Opener | Universal Converter Settings |
| 50 | UCT Opener | UC Browser Theme Format |
| 51 | UCV Opener | Universal Converter Conversion |
| 52 | UCX Opener | Rational XDE |
| 53 | UD Opener | OmniPage User Dictionary |
| 54 | UDA Opener | ZEMAX Model Data |
| 55 | UDB Opener | Dynamics AX User Database Format |
| 56 | UDC Opener | Adobe InDesign User Dictionary |
| 57 | UDCX Opener | Universal Data Connection Format |
| 58 | UDEB Opener | Debian Package Format |
| 59 | UDF Opener | Universal Disk Format Format |
| 60 | UDG Opener | UDraw(Graph) |
| 61 | UDI Opener | CorelDRAW Draw Script Textures Bitmap |
| 62 | UDID Opener | Google Android Unique Device IDentifier |
| 63 | UDIF Opener | Apple Mac OS X Universal Disk Image Format |
| 64 | UDK Opener | Unreal Engine Map Format |
| 65 | UDL Opener | Microsoft Universal Data Link Format |
| 66 | UDM Opener | MapView User Module |
| 67 | UDO Opener | Moray UDO 3D |
| 68 | UDP Opener | Corel VideoStudio Scene Information |
| 69 | UDR Opener | Jade Unstructured Data Resource Format |
| 70 | UDS Opener | FIMware Database Format |
| 71 | UDT Opener | User Defined Type Data Format |
| 72 | UDW Opener | Raw Unsigned DoubleWord (32-bit) Data |
| 73 | UDX Opener | PI Expert Design Software |
| 74 | UDZ Opener | UDA ConstructionSuite Data Format |
| 75 | UEA Opener | Protector Suite QL Encrypted Archive |
| 76 | UEC Opener | UltraEdit Settings Format |
| 77 | UEED Opener | Uconomix Encryption Engine Encrypted Directory |
| 78 | UEF Opener | Unified Emulator Format Format |
| 79 | UEL Opener | Tekla Structures Custom Components Data Format |
| 80 | UEM Opener | LDC Region Data Format |
| 81 | UENC Opener | UltraEdit Encrypted Text |
| 82 | UES Opener | Ulead Photo Explorer Slide Show |
| 83 | UEW Opener | UltraEdit Wordfile |
| 84 | UEZ Opener | Ulead COOL 3D Graphics |
| 85 | UF Opener | Crestron SIMPL+ X Generation Compiled Data Format |
| 86 | UFA Opener | GIF Animator Animation Object Information |
| 87 | UFC Opener | SATURN Suite |
| 88 | UFDR Opener | UFED Physical Analyzer Report Package |
| 89 | UFF Opener | DataWave SciWorks Physiological Data |
| 90 | UFI Opener | UFOCaptureV2 |
| 91 | UFM Opener | Unicode TrueType Font Format |
| 92 | UFO Opener | Ulead Format Object |
| 93 | UFP Opener | Ulead Photo Project |
| 94 | UFR Opener | Ultra Fractal Format |
| 95 | UFRAW Opener | UFRaw Data Format |
| 96 | UFS Opener | FreeBSD Unix Format System Format |
| 97 | UFSUZIP Opener | Compressed Unix Format System Format |
| 98 | UFX Opener | Ultimate 3D Game Engine Material |
| 99 | UGC Opener | Ace Of Spades Game Data Format |
| 100 | UGD Opener | Need For Speed Underground |
| 101 | UGI Opener | MultiGo Game Data Format |
| 102 | UGP Opener | Aroma Unit Genome Position Data Format |
| 103 | UGR Opener | Apophysis Gradient |
| 104 | UGZ Opener | MultiGo Compressed Game Data Format |
| 105 | UHA Opener | UHarc Compressed Archive |
| 106 | UHH Opener | Eurotherm Hydra History Encrypted |
| 107 | UHS Opener | Universal Hint System Binary |
| 108 | UHTM Opener | Unreal Tournament |
| 109 | UHTML Opener | UHTML Document Format |
| 110 | UI Opener | User Interface Format |
| 111 | UIBAK Opener | UltraISO Backup Disk Image |
| 112 | UIC Opener | COCO Unit ICon |
| 113 | UID Opener | IBM Voice Type Users |
| 114 | UID-ZPS Opener | Zoner Photo Studio Picture Autobackup |
| 115 | UIF Opener | Universal Image Format Disc Image |
| 116 | UIL Opener | IBM AIX User Interface Language |
| 117 | UIN Opener | ICQ 2001 Saved ICQ Contact Information |
| 118 | UIR Opener | LabWindows User Interface Resource |
| 119 | UIS Opener | WindowBlinds User Interface Specification |
| 120 | UIT Opener | UIX XML Template |
| 121 | UITEST Opener | Microsoft Visual Studio Data Format |
| 122 | UIX Opener | UiXML Page |
| 123 | UIZ Opener | Spybot Search & Destroy Updater |
| 124 | UK Opener | English (British) Language Translation |
| 125 | UKA Opener | Fifa World Cup Game Data |
| 126 | UKE Opener | Ulead VideoStudio Data Format |
| 127 | UKR Opener | Adobe Acrobat Language Resource Data Format |
| 128 | UKS Opener | Microsoft Works |
| 129 | UKX Opener | Unreal Animation Package |
| 130 | UKY Opener | UltraMixer Licence Key |
| 131 | UL Opener | Windows Updates Downloader Update List Format |
| 132 | ULAW Opener | Raw U-Law Audio Format |
| 133 | ULB Opener | COBOL Unisys Library |
| 134 | ULC Opener | RevaSoft ULC Application Format |
| 135 | ULD Opener | Unified Luminaire Datafile |
| 136 | ULF Opener | Universal List Format |
| 137 | ULG Opener | ULG Bitmap Image Format |
| 138 | ULI Opener | Microsoft Office Data Format |
| 139 | ULP Opener | EAGLE Script |
| 140 | ULS Opener | NetMeeting User Location Service Format |
| 141 | ULT Opener | UltraTracker Module |
| 142 | ULW Opener | U-Law Audio Format |
| 143 | ULYS Opener | Ulysses Project |
| 144 | ULZ Opener | USBlyzer Data Capture Format |
| 145 | UM3 Opener | XWE Data Format |
| 146 | UM4 Opener | Samsung Smart TV Video Format |
| 147 | UMAP Opener | Unreal Tournament Map Format |
| 148 | UMB Opener | MemMaker Backup |
| 149 | UMC Opener | SIMPL Application Format |
| 150 | UMD Opener | UMD Mobile Ebook |
| 151 | UMF Opener | MediaHolder Universal Media Format Format |
| 152 | UML Opener | UML Data Object Model |
| 153 | UMLCLASS Opener | UML Class Model |
| 154 | UMLX Opener | Visual UML XML Model |
| 155 | UMM Opener | Unified Molecular Modeling |
| 156 | UMOD Opener | Unreal Tournament Module Format |
| 157 | UMP Opener | UModel Project |
| 158 | UMPROFILE Opener | UltraMon Display Profile Format |
| 159 | UMR Opener | MyEclipse UML Model Repository |
| 160 | UMS Opener | Rune 3D Mesh Format |
| 161 | UMSHORTCUT Opener | UltraMon Data Format |
| 162 | UMV Opener | Are You Afraid Of The Dark? Video Data Format |
| 163 | UMX Opener | Deus Ex Format |
| 164 | UNA Opener | SIMS Unauthorized Data |
| 165 | UNAUTH Opener | SiteMinder Unauthorized Message Format |
| 166 | UNAVAILABLE Opener | Al-Namrood Ransomware Affected Format |
| 167 | UNCOMPRESSED_SIZE Opener | Singularity Game |
| 168 | UNF Opener | Btreive Unformatted |
| 169 | UNI Opener | MikMod UniMOD Module |
| 170 | UNIF Opener | Universal NES Image Format ROM Image Format |
| 171 | UNITXT Opener | YS FLIGHT Language |
| 172 | UNITY Opener | Unity Scene Format |
| 173 | UNITY3D Opener | Unity Web Player Format |
| 174 | UNITYPACKAGE Opener | Unity Package Format |
| 175 | UNITYPROJ Opener | Unity 3D Project |
| 176 | UNIT_VARIANT Opener | Total War Unit Variant Settings |
| 177 | UNIX Opener | Unix |
| 178 | UNK Opener | UVProbe Format |
| 179 | UNKNOWN Opener | Unknown Format Type |
| 180 | UNKNOWN_VIDEO Opener | Youtube API Video Information Format |
| 181 | UNL Opener | Garmin Unlock Format |
| 182 | UNQ Opener | ACT! 3.0 Email Message Attachment |
| 183 | UNR Opener | Unreal Level Map |
| 184 | UNREAL Opener | Unreal Tournament Link Format |
| 185 | UNRST Opener | OPM Data Format |
| 186 | UNS Opener | Visual Navigation Suite Export Or Import Settings |
| 187 | UNT Opener | AutoCAD Unit Definition Format |
| 188 | UNUSED Opener | Photoline 4 Defaults |
| 189 | UNV Opener | BusinessObjects Universe |
| 190 | UNX Opener | Unix Text Format |
| 191 | UOF Opener | Uniform Office Document |
| 192 | UOL Opener | PhotoImpact Clipart Image |
| 193 | UOP Opener | Uniform Office Presentation |
| 194 | UOS Opener | Uniform Office Spreadsheet |
| 195 | UOT Opener | Uniform Office Document |
| 196 | UPC Opener | Ultimate Paint Component |
| 197 | UPD Opener | Program Update Information |
| 198 | UPDATE Opener | ISAPI Update Format |
| 199 | UPDATR Opener | IConomy Update Format |
| 200 | UPDF Opener | UltraPdf Publication |
| 201 | UPF Opener | Nokia Phone Digital Photo Format |
| 202 | UPG Opener | Firmware Upgrade Format |
| 203 | UPI Opener | Ulead PhotoImpact Plugin |
| 204 | UPJ Opener | Ulead Project |
| 205 | UPK Opener | Unreal Engine 3 Package |
| 206 | UPK0 Opener | Metro 2033 Game |
| 207 | UPK1 Opener | Metro 2033 Game Data Format |
| 208 | UPKG Opener | Unreal Engine Package Flag Format |
| 209 | UPL Opener | StarMoney Agent Download |
| 210 | UPLUGIN Opener | Unreal Tournament Plugin Format |
| 211 | UPM Opener | PenMail |
| 212 | UPO Opener | DBASE Compiled Update Data |
| 213 | UPOI Opener | IGO Points Of Interest Format |
| 214 | UPP Opener | Ghostscript Uniprint Unified Printer Parameter |
| 215 | UPR Opener | FileMaker User Spelling Dictionary |
| 216 | UPROJECT Opener | Unreal Tournament Game Data Format |
| 217 | UPS Opener | Microsoft Works |
| 218 | UPX Opener | Ultimate Packer For EXecutables Format |
| 219 | UPZ Opener | StarMoney Agent Download |
| 220 | UQM Opener | The Ur-Quan Masters Game Data Format |
| 221 | URC Opener | Unicenter Remote Control |
| 222 | URD Opener | Ultra Recall Database |
| 223 | URD-JOURNAL Opener | Ultra Recall Journal Update |
| 224 | URF Opener | AppFace Skin |
| 225 | URL Opener | Internet Shortcut |
| 226 | URLS Opener | GetRight Internet Shortcuts List |
| 227 | URL_ Opener | Internet Shortcut - URL - Uniform Resource Locator |
| 228 | URN Opener | H3DAPI Uniform Resource Name Data Format |
| 229 | URP Opener | Universal Report |
| 230 | URQ Opener | Review QuickChart Chart |
| 231 | URR Opener | Uniface Signatures Format |
| 232 | URS Opener | ControlDraw User Requirement Specifier |
| 233 | URT Opener | Utah Raster Toolkit Format |
| 234 | US Opener | English Language Translation |
| 235 | US? Opener | Microsoft Word Font |
| 236 | USA Opener | Microsoft Office Headers Format |
| 237 | USB Opener | SiSoftware Sandra |
| 238 | USBLOG Opener | Usb Sniffer Log Format |
| 239 | USC Opener | USC Module Definition |
| 240 | USDX Opener | Tom Clancys Rainbow Six: Vegas Game Data Format |
| 241 | USDZ Opener | USDZ Augmented Reality Format Format Format |
| 242 | USECASEDIAGRAM Opener | Microsoft Visual Studio Use Case Diagram |
| 243 | USEQ Opener | USeq Genome Data Format |
| 244 | USER Opener | Visual Studio Project User Options Format |
| 245 | USERKIT Opener | DrumCore Audio Format |
| 246 | USERPROFILE Opener | Norton Antivirus User Profile Format |
| 247 | USERSETTINGS Opener | User Settings Format |
| 248 | USERTILE-MS Opener | Windows 8 User Tile Format |
| 249 | USF Opener | Nintendo 64 Music Format |
| 250 | USFLIB Opener | Nintendo 64 Song Library |
| 251 | USG Opener | PC-Doctor For Windows |
| 252 | USH Opener | Creston SIMPL Windows |
| 253 | USI Opener | UsiXML UI Description |
| 254 | USL Opener | ProWORX Nxt USL Loadable |
| 255 | USM Opener | USM Game Video Format |
| 256 | USP Opener | PageMaker Printer Font |
| 257 | USR Opener | FileMaker Pro Database Format |
| 258 | USS Opener | WinUAE Saved State |
| 259 | UST Opener | WiFi SiStr Exported User Theme Format |
| 260 | USTAR Opener | Uniform Standard Tape Archive Format Format |
| 261 | USV Opener | LG Xenon Mobile Phone Contact List Format |
| 262 | USX Opener | Unreal Static Meshes |
| 263 | USZ Opener | Stardock WindowBlinds SkinStudio Data Format |
| 264 | UT2 Opener | Unreal Tournament Map |
| 265 | UT2LINK Opener | Unreal Tournament 2004 Game Data Format |
| 266 | UT2MOD Opener | Unreal Tournament 2003/2004 Module Format |
| 267 | UT3 Opener | Unreal Tournament 3 Map Format |
| 268 | UT4MOD Opener | Unreal Tournament 2004 Module |
| 269 | UT8 Opener | Ghost Master Language Format |
| 270 | UTB Opener | µTBackup Backup |
| 271 | UTC Opener | Bioware Creature Format |
| 272 | UTD Opener | BioWare Aurora Game Engine Door |
| 273 | UTE Opener | BioWare Aurora Game Engine Encounter |
| 274 | UTF8 Opener | Unicode UTF8-Encoded Text Document |
| 275 | UTI Opener | Spybot - Search & Destroy Includes |
| 276 | UTL Opener | QuickBooks Data |
| 277 | UTM Opener | BioWare Aurora Game Engine Store |
| 278 | UTP Opener | BioWare Aurora Game Engine Placeable Object |
| 279 | UTPART Opener | µTorrent Unfinished Download |
| 280 | UTS Opener | Spybot - Search & Destroy Include |
| 281 | UTT Opener | BioWare Aurora Engine Trigger |
| 282 | UTW Opener | Unity Whirld Format |
| 283 | UTX Opener | Unreal Texture Package |
| 284 | UTXT Opener | Unicode Text Format |
| 285 | UTZ Opener | UIQ Theme Package |
| 286 | UU Opener | Uuencoded Format |
| 287 | UUD Opener | UUDecoded Format |
| 288 | UUE Opener | Uuencoded Format |
| 289 | UUM Opener | Minuum Keyboard Backup Format |
| 290 | UUS Opener | Ultra Utility Skin |
| 291 | UV2 Opener | µVision Project |
| 292 | UVCAB Opener | UVScreenCamera Films |
| 293 | UVF Opener | Uncertain Value Format |
| 294 | UVKBK Opener | Ultra Virus Killer Backup Information Format |
| 295 | UVKEY Opener | Ultra Virus Killer License Format |
| 296 | UVKSR Opener | Ultra Virus Killer System Repair Settings Format |
| 297 | UVN Opener | Yamaha Tyros Audio Format |
| 298 | UVNTS Opener | UVScreenCamera Notes |
| 299 | UVOPT Opener | µVision Project Options Format |
| 300 | UVOPTX Opener | µVision Configuration Format |
| 301 | UVPRJX Opener | µVision Project Format |
| 302 | UVPROJ Opener | µVision4 Project |
| 303 | UVPROJX Opener | µVision Project Format |
| 304 | UVR Opener | UVR Mesh |
| 305 | UVS Opener | UVScreenCamera Segments |
| 306 | UVSEG Opener | UVScreenCamera Segments |
| 307 | UVU Opener | Movie Maker Video Data Format |
| 308 | UVW Opener | 3D Studio MAX UVW Coordinates |
| 309 | UVX Opener | Unreal Tournament 2003 Saved Game |
| 310 | UW Opener | Unsigned Word Audio Format |
| 311 | UWF Opener | UltraTracker Wave Format |
| 312 | UWL Opener | User Word List Format |
| 313 | UXDC Opener | Microsoft Excel Data Retrieval Service Connection |
| 314 | UXF Opener | UMLet UML EXchange Format |
| 315 | UXX Opener | Unreal Tournament Cache |
| 316 | UXY Opener | Barudan Embroidery Outline |
| 317 | UYVY Opener | YUV 16-bit Image Format |
| 318 | UZ2 Opener | Unreal Tournament Compressed |
| 319 | UZE Opener | UltimateZip Compressed Archive |
| 320 | UZED Opener | Family Tree Builder Compressed Unicode GEDCOM Data Format |
| 321 | UZIP Opener | FreeBSD Compressed Disk Image |
| 322 | UZY Opener | Backdoor.Sokacaps |
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