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.u |
Unreal Tournament Class Package |
Epic Games |
.u10 |
UFile 2010 Tax Return |
Dr Tax Software |
.u11 |
UFile 2011 Tax Return |
Dr Tax Software |
.u12 |
UFile 2012 Tax Return |
Dr Tax Software |
.u3d |
Universal 3D File |
3D Industry Forum |
.u3i |
U3 Application Information File |
N/A |
.u3p |
U3 Smart Application |
SanDisk |
.u8 |
3D Lemmings Audio File |
Clockwork Games |
.uax |
Unreal Audio Package |
Epic Games |
.ub |
Unsigned Byte Audio File |
N/A |
.ubj |
Universal Binary JSON File |
The Buzz Media |
.ubox |
Universe Sandbox Data File |
Universe Sandbox |
.uc |
UnrealScript Class |
N/A |
.uc2 |
UltraCompressor 2 Archive |
N/A |
.uccapilog |
Microsoft UCC API Log File |
Microsoft |
.uce |
Windows UCE System File |
Microsoft |
.ucf |
WebEx Media File |
Cisco Systems |
.uci |
UFS Explorer Backup File |
SysDevSoftware |
.ucl |
Killing Floor System File |
Tripwire Interactive |
.ucm |
Crazy Machines Model File |
Viva Media |
.uct |
UC Browser Theme File |
UC Mobile |
.ud |
OmniPage User Dictionary |
Nuance Communications |
.udb |
Dynamics AX User Database File |
Microsoft |
.udc |
Adobe InDesign User Dictionary |
Adobe Systems |
.udcx |
Universal Data Connection File |
Microsoft |
.udeb |
Debian Package File |
The Debian Project |
.udf |
Universal Disk Format File |
Optical Storage Technology Association |
.udk |
Unreal Engine Map File |
Epic Games |
.udl |
Microsoft Universal Data Link File |
Microsoft |
.uds |
Sierra Generations File |
Sierra |
.uea |
Protector Suite QL Encrypted Archive |
AuthenTec |
.ufo |
Ulead File Object |
Ulead |
.ufr |
Ultra Fractal File |
Frederik Slijkerman |
.ufs |
FreeBSD Unix File System File |
The FreeBSD Project |
.ufs.uzip |
Compressed Unix File System File |
The FreeBSD Project |
.uha |
UHarc Compressed Archive |
UHarc |
.uhtml |
UC Browser Saved Webpage |
UC Mobile |
.ui |
User Interface File |
Nokia |
.uibak |
UltraISO Backup Disk Image |
EZB Systems |
.uif |
Universal Image Format Disc Image |
MagicISO |
.uis |
WindowBlinds User Interface Specification |
Stardock |
.ukx |
Unreal Animation Package |
Epic Games |
.ulaw |
Raw u-Law Audio File |
N/A |
.ulf |
Universal List File |
N/A |
.uls |
NetMeeting User Location Service File |
Microsoft |
.ult |
UltraTracker Module |
N/A |
.ulw |
u-Law Audio File |
N/A |
.ulz |
USBlyzer Data Capture File |
USBlyzer |
.umf |
MediaHolder Universal Media Format File |
GetMediaHolder.com |
.uml |
UML Data Object Model |
N/A |
.umlclass |
UML Class Model |
N/A |
.umod |
Unreal Tournament Module File |
Epic Games |
.ums |
Rune 3D Mesh File |
Human Head Studios |
.umx |
Unreal Music Package |
Epic Games |
.unauth |
SiteMinder Unauthorized Message File |
Netegrity |
.uni |
MikMod UniMOD Module |
N/A |
.unity |
Unity Scene File |
Unity Technologies |
.unity3d |
Unity Web Player File |
Unity Technologies |
.unitypackage |
Unity Package File |
Unity Technologies |
.unk |
Unknown File |
N/A |
.unknown |
Unknown File Type |
N/A |
.unl |
Garmin Unlock File |
Garmin |
.unr |
Unreal Level Map |
N/A |
.unt |
AutoCAD Unit Definition File |
Autodesk |
.unx |
Unix Text File |
N/A |
.uof |
Uniform Office Document |
N/A |
.uop |
Uniform Office Presentation |
N/A |
.uos |
Uniform Office Spreadsheet |
N/A |
.uot |
Uniform Office Document |
N/A |
.upd |
Program Update Information |
N/A |
.update |
ISAPI Update File |
EggCentric |
.updatr |
iConomy Update File |
Nijikokun |
.upf |
MicroStation User Preferences File |
Bentley Systems |
.upg |
Upgrade File |
N/A |
.upk |
Unreal Engine 3 Package |
Epic Games |
.upoi |
iGO Points of Interest File |
Nav N Go |
.upr |
Fractal Parameters File |
N/A |
.upx |
Ultimate Packer for eXecutables File |
Markus Oberhumer |
.uqm |
The Ur-Quan Masters Game Data File |
The Ur-Quan Masters |
.url |
Internet Shortcut |
N/A |
.urr |
Uniface Signatures File |
Compuware |
.urt |
Utah Raster Toolkit File |
N/A |
.usa |
Unreal Saved Game File |
Epic Games |
.useq |
USeq Genome Data File |
Huntsman Cancer Institute |
.user |
Visual Studio Project User Options File |
Microsoft |
.userprofile |
Norton Antivirus User Profile File |
Symantec |
.usertile-ms |
Windows 8 User Tile File |
Microsoft |
.usf |
Nintendo 64 Music File |
N/A |
.usflib |
Nintendo 64 Song Library |
N/A |
.usm |
USM Game Video File |
N/A |
.usr |
FileMaker Pro Database File |
FileMaker |
.ust |
UTAU Sequence Text File |
UTAU |
.ustar |
Uniform Standard Tape Archive Format File |
N/A |
.usx |
Unreal Static Meshes |
Epic Games |
.ut2 |
Unreal Tournament Map |
Epic Games |
.ut2mod |
Unreal Tournament 2003/2004 Module File |
Epic Games |
.ut3 |
Unreal Tournament 3 Map File |
Epic Games |
.ut4mod |
Unreal Tournament 2004 Module |
Epic Games |
.ut8 |
Ghost Master Language File |
Sick Puppies |
.utc |
Bioware Creature File |
BioWare |
.utf8 |
Unicode UTF8-Encoded Text Document |
N/A |
.utw |
Unity Whirld File |
Aubrey Falconer |
.utx |
Unreal Texture Package |
Epic Games |
.utxt |
Unicode Text File |
N/A |
.utz |
UIQ Theme Package |
UIQ Technology |
.uu |
Uuencoded File |
N/A |
.uud |
UUDecoded File |
N/A |
.uue |
Uuencoded File |
N/A |
.uvf |
Uncertain Value Format |
N/A |
.uvx |
Unreal Tournament 2003 Saved Game |
Epic Games |
.uw |
Unsigned Word Audio File |
N/A |
.uwf |
UltraTracker Wave File |
N/A |
.uwl |
User Word List File |
Corel |
.uxx |
Unreal Tournament Cache |
N/A |
.uzip |
FreeBSD Compressed Disk Image |
Maxim Sobolev |