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