| # |
File extension |
Developer |
| 0 |
.U - Subsampled Raw YUV Bitmap Image |
Epic Games |
| 1 |
.U00 - The Price Is Right 2010 Game |
Ludia Inc. |
| 2 |
.U01 - Barudan Embroidery |
Barudan |
| 3 |
.U08 - UFile Data |
Dr Tax Software |
| 4 |
.U10 - UFile 2010 Tax Return Format |
Dr Tax Software |
| 5 |
.U11 - UFile 2011 Tax Return Format |
Dr Tax Software |
| 6 |
.U12 - UFile 2012 Tax Return Format |
Dr Tax Software |
| 7 |
.U255LAW - Exponential 8-bit Sound |
N/A |
| 8 |
.U2CAR - NFS:U2 Car |
N/A |
| 9 |
.U32 - Authorware Cover |
Adobe Systems Incorporated |
| 10 |
.U3D - Universal 3D Format |
3D Industry Forum |
| 11 |
.U3I - U3 Application Information Format |
N/A |
| 12 |
.U3P - U3 Platform Install Format |
SanDisk |
| 13 |
.U8 - Lemings 3D Audio Format |
Clockwork Games |
| 14 |
.U96 - EasyZip Temporary |
ConeXware, Inc. |
| 15 |
.UAE - WinUAE Configuration |
N/A |
| 16 |
.UAL - Entrust Unattended Login Credentials |
Entrust |
| 17 |
.UAP - SIMATIC WinCC User Archive Export |
Siemens AG |
| 18 |
.UAQ - Microsoft Windows Action Queue |
Microsoft Corporation |
| 19 |
.UAS - Ulead PhotoImpact Backup |
Ulead Systems |
| 20 |
.UAV - OpenPilot UAV Settings |
OpenPilot Foundation |
| 21 |
.UAX - Unreal Audio Format |
Epic Games |
| 22 |
.UB - Unsigned Byte Audio Format |
N/A |
| 23 |
.UBIFS - Linux UBIFS Image |
N/A |
| 24 |
.UBJ - Universal Binary JSON Fiile |
The Buzz Media |
| 25 |
.UBM - IPhoto Mtwain Install |
N/A |
| 26 |
.UBOX - Universe Sandbox Saved Data Format |
Universe Sandbox |
| 27 |
.UBR - IIS WCAT Configuration |
Microsoft Corporation |
| 28 |
.UC - UnrealScript Class |
N/A |
| 29 |
.UC2 - UltraCompressor II Compressed Archive Format |
N/A |
| 30 |
.UCCAPILOG - Microsoft Windows Live Messenger UCC API Log Format |
Microsoft |
| 31 |
.UCD - Prosa Diagram |
Insoft Oy. |
| 32 |
.UCE - Microsoft Windows XP System32 Format |
Microsoft |
| 33 |
.UCF - WebEx Universal Communications Format |
Cisco Systems |
| 34 |
.UCI - UFS Explorer Backup Format |
SysDevSoftware |
| 35 |
.UCL - Unreal Tournament Cache Format |
Epic Games, Inc. |
| 36 |
.UCLS - ObjectAid UML Explorer Class Diagram |
ObjectAid LLC |
| 37 |
.UCM - Urban Chaos Game Format |
Viva Media |
| 38 |
.UCP - SmartWare Communications Profile |
SmartWare Corporation |
| 39 |
.UCR - MicroSim PCBoard Unrouted Nets Report |
Cadence Design Systems, Inc. |
| 40 |
.UCS - Homeworld Localized Unicode Strings |
Relic Entertainment Inc. |
| 41 |
.UCSETTINGS - Universal Converter Settings |
Anthony R. Daly |
| 42 |
.UCT - UC Browser Theme Format |
UC Mobile |
| 43 |
.UCV - Universal Converter Conversion |
Anthony R. Daly |
| 44 |
.UCX - Rational XDE |
IBM |
| 45 |
.UD - OmniPage User Dictionary |
Nuance Communications |
| 46 |
.UDA - ZEMAX Model Data |
ZEMAX Development Corporation |
| 47 |
.UDB - Dynamics AX User Database Format |
Microsoft |
| 48 |
.UDC - Adobe User Dictionary Format |
Adobe Systems |
| 49 |
.UDCX - Microsoft Office Universal Data Connection Format |
Microsoft |
| 50 |
.UDEB - Debian Package Format |
The Debian Project |
| 51 |
.UDF - Universal Disk Format |
Optical Storage Technology Association |
| 52 |
.UDG - UDraw(Graph) |
Universität Bremen |
| 53 |
.UDI - CorelDRAW Draw Script Textures Bitmap |
Corel Corporation |
| 54 |
.UDID - Google Android Unique Device IDentifier |
Google Inc. |
| 55 |
.UDIF - Apple Mac OS X Universal Disk Image Format |
Apple, Inc. |
| 56 |
.UDK - Unreal Map Format |
Epic Games |
| 57 |
.UDL - Microsoft Data Link Format |
Microsoft |
| 58 |
.UDM - MapView User Module |
MotCreations.com |
| 59 |
.UDO - Moray UDO 3D |
N/A |
| 60 |
.UDP - Corel VideoStudio Scene Information |
Corel Corporation |
| 61 |
.UDS - FIMware Database Format |
UB Foundation Activities, Inc |
| 62 |
.UDW - Raw Unsigned DoubleWord (32-bit) Data |
N/A |
| 63 |
.UDX - PI Expert Design Software |
Power Integrations |
| 64 |
.UEA - Protector Suite QL Format |
AuthenTec |
| 65 |
.UEED - Uconomix Encryption Engine Encrypted Directory |
Uconomix Technologies |
| 66 |
.UENC - UltraEdit Encrypted Text |
IDM Computer Solutions, Inc. |
| 67 |
.UES - Ulead Photo Explorer Slide Show |
Corel Corporation |
| 68 |
.UEW - UltraEdit Wordfile |
IDM Computer Solutions, Inc. |
| 69 |
.UEZ - Ulead COOL 3D Graphics |
Ulead Systems |
| 70 |
.UFA - GIF Animator Animation Object Information |
N/A |
| 71 |
.UFC - SATURN Suite |
Atkins-ITS Transport Software |
| 72 |
.UFDR - UFED Physical Analyzer Report Package |
Cellebrite Mobile Synchronization LTD. |
| 73 |
.UFF - DataWave SciWorks Physiological Data |
DataWave Technologies |
| 74 |
.UFI - UFOCaptureV2 |
SonotaCo |
| 75 |
.UFO - Ulead PhotoImpact Object Format |
Ulead |
| 76 |
.UFP - Ulead Photo Project |
Corel Corporation |
| 77 |
.UFR - Ultra Fractal Format |
Frederik Slijkerman |
| 78 |
.UFS - FreeBSD PC-BSD Unix File System Format |
The FreeBSD Project |
| 79 |
.UFS.UZIP - FreeBSD Compressed Unix File System Format |
The FreeBSD Project |
| 80 |
.UFX - Ultimate 3D Game Engine Material |
Ultimate 3D |
| 81 |
.UGD - Need For Speed Underground |
Electronic Arts, Inc. |
| 82 |
.UGR - Apophysis Gradient |
Mark Townsend |
| 83 |
.UHA - UHARC Compressed Archive |
UHarc |
| 84 |
.UHH - Eurotherm Hydra History Encrypted |
Eurotherm UK |
| 85 |
.UHS - Universal Hint System Binary |
Jason Strautman |
| 86 |
.UHTM - Unreal Tournament |
Epic Games, Inc. |
| 87 |
.UHTML - UHTML Document Format |
N/A |
| 88 |
.UI - User Interface Format |
Nokia |
| 89 |
.UIBAK - UltraISO Backup Disk Image |
EZB Systems |
| 90 |
.UIC - COCO Unit ICon |
N/A |
| 91 |
.UID - IBM Voice Type Users |
IBM |
| 92 |
.UID-ZPS - Zoner Photo Studio Picture Autobackup |
ZONER, Inc. |
| 93 |
.UIF - MagicISO Universal Image Format |
MagicISO |
| 94 |
.UIL - IBM AIX User Interface Language |
IBM |
| 95 |
.UIN - ICQ 2001 Saved ICQ Contact Information |
ICQ LLC |
| 96 |
.UIR - LabWindows User Interface Resource |
National Instruments Corporation |
| 97 |
.UIS - WindowBlinds Personality Format |
Stardock |
| 98 |
.UIT - UIX XML Template |
N/A |
| 99 |
.UIX - UiXML Page |
Oracle Corporation |
| 100 |
.UIZ - Spybot Search & Destroy Updater |
Safer-Networking Ltd. |
| 101 |
.UK - English (British) Language Translation |
N/A |
| 102 |
.UKA - Fifa World Cup Game Data |
Electronic Arts, Inc. |
| 103 |
.UKS - Microsoft Works |
Microsoft Corporation |
| 104 |
.UKX - Unreal Tournament Animation Format |
Epic Games |
| 105 |
.UKY - UltraMixer Licence Key |
UltraMixer Digital Audio Solutions |
| 106 |
.ULAW - Raw CCITT/ITU G.711 US Telephony Audio Format |
N/A |
| 107 |
.ULB - COBOL Unisys Library |
N/A |
| 108 |
.ULD - Unified Luminaire Datafile |
DIAL GMBH |
| 109 |
.ULF - Universal List Format |
N/A |
| 110 |
.ULP - EAGLE Script |
CadSoft Computer, Inc. |
| 111 |
.ULS - NetMeeting User Location Service Format |
Microsoft |
| 112 |
.ULT - Ultratracker Music Module (MOD) Format |
N/A |
| 113 |
.ULW - U-Law Audio Format |
N/A |
| 114 |
.ULYS - Ulysses Project |
The Soulmen |
| 115 |
.ULZ - USBlyzer Data Capture Format |
USBlyzer |
| 116 |
.UMB - MemMaker Backup |
Microsoft Corporation |
| 117 |
.UMD - UMD Mobile Ebook |
jumd team |
| 118 |
.UMF - MediaHolder Media Format |
GetMediaHolder.com |
| 119 |
.UML - Visual UML Class Diagram & Model Format |
N/A |
| 120 |
.UMLCLASS - Java UML Class Model Format |
N/A |
| 121 |
.UMLX - Visual UML XML Model |
Visual Object Modelers, Inc. |
| 122 |
.UMM - Unified Molecular Modeling |
N/A |
| 123 |
.UMOD - Unreal Tournament MOD Installation Package Format |
Epic Games |
| 124 |
.UMP - UModel Project |
Altova |
| 125 |
.UMR - MyEclipse UML Model Repository |
Genuitec, LLC |
| 126 |
.UMS - Rune 3D Mesh Format |
Human Head Studios |
| 127 |
.UMX - Deus Ex Format |
Eidos Interactive Ltd. |
| 128 |
.UNA - SIMS Unauthorized Data |
Capita Business Services Ltd. |
| 129 |
.UNAUTH - SiteMinder Unauthorized Message Format |
Netegrity |
| 130 |
.UNCOMPRESSED_SIZE - Singularity Game |
Raven Software |
| 131 |
.UNF - Btreive Unformatted |
Novell, Inc. |
| 132 |
.UNI - UniMOD/MikMOD Music Module Format |
N/A |
| 133 |
.UNITXT - YS FLIGHT Language |
N/A |
| 134 |
.UNITY - Unity Scene Format |
Unity Technologies |
| 135 |
.UNITY3D - Unity Scene Web Player Format |
Unity Technologies |
| 136 |
.UNITYPACKAGE - Unity Package Format |
Unity Technologies |
| 137 |
.UNITYPROJ - Unity 3D Project |
Unity Technologies |
| 138 |
.UNIT_VARIANT - Total War Unit Variant Settings |
The Creative Assembly |
| 139 |
.UNIX - Unix |
The Open Group |
| 140 |
.UNK - UVProbe Format |
N/A |
| 141 |
.UNKNOWN - Unknown File Extension |
N/A |
| 142 |
.UNL - Garmin MapSource Unlock Format |
Garmin |
| 143 |
.UNQ - ACT! 3.0 Email Message Attachment |
The Sage Group plc |
| 144 |
.UNR - Unreal Map Format |
N/A |
| 145 |
.UNS - Visual Navigation Suite Export Or Import Settings |
Nobeltec, Inc. |
| 146 |
.UNT - AutoCAD Unit Definition Format |
Autodesk |
| 147 |
.UNUSED - Photoline 4 Defaults |
Impressum |
| 148 |
.UNV - BusinessObjects Universe |
SAP AG |
| 149 |
.UNX - Unix Text Format |
N/A |
| 150 |
.UOF - Uniform Office Format |
N/A |
| 151 |
.UOL - PhotoImpact Clipart Image |
Ulead Systems |
| 152 |
.UOP - Unified Office Format Presentation Format |
N/A |
| 153 |
.UOS - Unified Office Format Spreadsheet Format |
N/A |
| 154 |
.UOT - Unified Office Format Text Format |
N/A |
| 155 |
.UPC - Ultimate Paint Component |
J-T-L Development Inc. |
| 156 |
.UPD - Update Format |
N/A |
| 157 |
.UPDATE - ISAPI Update Format |
EggCentric |
| 158 |
.UPDATR - IConomy Update Format |
Nijikokun |
| 159 |
.UPDF - UltraPdf Publication |
Software995 |
| 160 |
.UPF - Nokia Phone Digital Photo Format |
Nokia |
| 161 |
.UPG - Firmware Upgrade Format |
N/A |
| 162 |
.UPI - Ulead PhotoImpact Plugin |
N/A |
| 163 |
.UPJ - Ulead Project |
N/A |
| 164 |
.UPK - Unreal 3 Game Data Package Format |
Epic Games |
| 165 |
.UPK0 - Metro 2033 Game |
4A Games |
| 166 |
.UPL - StarMoney Agent Download |
Star Finanz GmbH |
| 167 |
.UPM - PenMail |
UC-Logic Technology Corp. |
| 168 |
.UPO - DBASE Compiled Update Data |
dataBased Intelligence, Inc. |
| 169 |
.UPOI - IGO Points Of Interest Format |
Nav N Go |
| 170 |
.UPP - Ghostscript Uniprint Unified Printer Parameter |
Artifex Software |
| 171 |
.UPR - FileMaker User Spelling Dictionary |
N/A |
| 172 |
.UPS - Microsoft Works |
Microsoft Corporation |
| 173 |
.UPX - Ultimate Packer For EXecutable Format |
Markus Oberhumer |
| 174 |
.UPZ - StarMoney Agent Download |
Star Finanz GmbH |
| 175 |
.UQM - The Ur-Quan Masters Archive Format |
The Ur-Quan Masters |
| 176 |
.URC - Unicenter Remote Control |
CA Technologies |
| 177 |
.URD - Ultra Recall Database |
Kinook Software, Inc. |
| 178 |
.URD-JOURNAL - Ultra Recall Journal Update |
Kinook Software, Inc. |
| 179 |
.URF - AppFace Skin |
Matinsoft Inc. |
| 180 |
.URL - Internet Shortcut - URL - Uniform Resource Locator |
N/A |
| 181 |
.URLS - GetRight Internet Shortcuts List |
Headlight Software, Inc. |
| 182 |
.URL_ - Internet Shortcut - URL - Uniform Resource Locator |
N/A |
| 183 |
.URP - Universal Report |
Universal Software C. T. |
| 184 |
.URQ - Review QuickChart Chart |
Eurotherm UK |
| 185 |
.URR - Uniface Signatures Format |
Compuware |
| 186 |
.URS - ControlDraw User Requirement Specifier |
ControlDraw Ltd. |
| 187 |
.URT - Utah Run-Length Encoded Bitmap Image Format |
N/A |
| 188 |
.US - English Language Translation |
N/A |
| 189 |
.US? - Microsoft Word Font |
Microsoft Corporation |
| 190 |
.USA - Microsoft Office Headers Format |
Microsoft |
| 191 |
.USB - SiSoftware Sandra |
SiSoftware |
| 192 |
.USC - USC Module Definition |
Analogue Process Control Services |
| 193 |
.USECASEDIAGRAM - Microsoft Visual Studio Use Case Diagram |
Microsoft Corporation |
| 194 |
.USEQ - USeq Genome Data Format |
Huntsman Cancer Institute |
| 195 |
.USER - Microsoft Visual Studio Project User Options Format |
Microsoft |
| 196 |
.USERPROFILE - Norton Antivirus User Profile Format |
Symantec |
| 197 |
.USERTILE-MS - Microsoft Windows 8 Release Preview User Tile Format |
Microsoft |
| 198 |
.USF - Nintendo Ultra 64 Sound Format |
N/A |
| 199 |
.USFLIB - Nintendo 64 Song Library Format |
N/A |
| 200 |
.USG - PC-Doctor For Windows |
PC-Doctor, Inc. |
| 201 |
.USH - Creston SIMPL Windows |
Creston Electronics, Inc. |
| 202 |
.USI - UsiXML UI Description |
N/A |
| 203 |
.USL - ProWORX Nxt USL Loadable |
Schneider Electric S.A. |
| 204 |
.USM - USM Game Video Format |
N/A |
| 205 |
.USP - PageMaker Printer Font |
Adobe Systems Incorporated |
| 206 |
.USR - FileMaker Pro Runtime Engine Database Application |
FileMaker |
| 207 |
.USS - WinUAE Saved State |
N/A |
| 208 |
.UST - WiFi SiStr Exported User Theme Format |
DNsoft |
| 209 |
.USTAR - Uniform Standard Tape Archive Format |
N/A |
| 210 |
.USX - Unreal StaticMesh (hardware Brushes) Format |
Epic Games |
| 211 |
.UT2 - Unreal Tournament Map Format |
Epic Games |
| 212 |
.UT2MOD - Unreal Tournament 2003 MOD Installation Package Format |
Epic Games |
| 213 |
.UT3 - Unreal Tournament 3 Map Format |
Epic Games |
| 214 |
.UT4MOD - Unreal Tournament 2004 MOD Installation Package Format |
Epic Games |
| 215 |
.UT8 - Ghost Master Language Format |
Sick Puppies |
| 216 |
.UTB - µTBackup Backup |
N/A |
| 217 |
.UTC - BioWare Aurora Game Engine Creature Format |
BioWare |
| 218 |
.UTD - BioWare Aurora Game Engine Door |
BioWare |
| 219 |
.UTE - BioWare Aurora Game Engine Encounter |
BioWare |
| 220 |
.UTF8 - Unicode UTF-8 Encoded Text |
N/A |
| 221 |
.UTI - Spybot - Search & Destroy Includes |
Safer-Networking Ltd. |
| 222 |
.UTL - QuickBooks Data |
Intuit Inc. |
| 223 |
.UTM - BioWare Aurora Game Engine Store |
BioWare |
| 224 |
.UTP - BioWare Aurora Game Engine Placeable Object |
BioWare |
| 225 |
.UTPART - µTorrent Unfinished Download |
BitTorrent, Inc. |
| 226 |
.UTS - Spybot - Search & Destroy Include |
Safer-Networking Ltd. |
| 227 |
.UTT - BioWare Aurora Engine Trigger |
BioWare |
| 228 |
.UTW - Unity Whirld Format |
Aubrey Falconer |
| 229 |
.UTX - Unreal Texture Format |
Epic Games |
| 230 |
.UTXT - Unicode Text Format |
N/A |
| 231 |
.UTZ - UIQ Theme Package |
UIQ Technology |
| 232 |
.UU - Uuencoded (compressed) File Archive (ascii) |
N/A |
| 233 |
.UUD - UUDecoded Format |
N/A |
| 234 |
.UUE - UUEncoded Format |
N/A |
| 235 |
.UUS - Ultra Utility Skin |
BobaFett |
| 236 |
.UV2 - µVision Project |
ARM Holdings plc |
| 237 |
.UVCAB - UVScreenCamera Films |
UVsoftium |
| 238 |
.UVF - Uncertain Value Format |
N/A |
| 239 |
.UVNTS - UVScreenCamera Notes |
UVsoftium |
| 240 |
.UVPROJ - µVision4 Project |
ARM Holdings plc |
| 241 |
.UVR - UVR Mesh |
N/A |
| 242 |
.UVS - UVScreenCamera Segments |
UVsoftium |
| 243 |
.UVSEG - UVScreenCamera Segments |
N/A |
| 244 |
.UVW - 3D Studio MAX UVW Coordinates |
Autodesk, Inc. |
| 245 |
.UVX - Unreal Tournament Saved Game |
Epic Games |
| 246 |
.UW - Unsigned Word (16-bit) Music Format |
N/A |
| 247 |
.UWF - UltraTracker WaveSample Music Format |
N/A |
| 248 |
.UWL - Corel WordPerfect User Word List Format |
Corel |
| 249 |
.UXDC - Microsoft Excel Data Retrieval Service Connection |
Microsoft Corporation |
| 250 |
.UXF - UMLet UML EXchange Format |
UMLet Team |
| 251 |
.UXX - Unreal Tournament 2003 Cache Format |
N/A |
| 252 |
.UXY - Barudan Embroidery Outline |
Barudan |
| 253 |
.UYVY - YUV 16-bit Image Format |
N/A |
| 254 |
.UZ2 - Unreal Tournament Compressed |
Epic Games, Inc. |
| 255 |
.UZE - UltimateZip Compressed Archive |
SWE von Schleusen |
| 256 |
.UZIP - FreeBSD Compressed Disk Image Format |
Maxim Sobolev |
| 257 |
.UZY - Backdoor.Sokacaps |
N/A |
