U File Extensions

File types with extensions that start with the letter U.

Extension	File Type	File Description
.u	Game	Unreal Tournament Class Package
.u	Audio	AU Audio File
.u	Image	Subsampled Raw YUV Image
.u3d	3D Image	Universal 3D File
.u3i	Text	U3 Application Information File
.u3p	Executable	U3 Smart Application
.uax	Game	Unreal Audio Package
.ub	Audio	Unsigned Byte Audio File
.uc	Game	UnrealScript Class
.uc2	Compressed	UltraCompressor 2 Archive
.uccapilog	Data	Microsoft UCC API Log File
.ucf	Web	WebEx Media File
.uci	Backup	UFS Explorer Backup File
.ud	Data	OmniPage User Dictionary
.udb	Data	Dynamics AX User Database File
.udeb	Data	Debian Package File
.udf	Executable	Excel User Defined Function
.uds	Data	Sierra Generations File
.uds	Data	Uniform Data System File
.ufo	Raster Image	Ulead File Object
.uha	Compressed	UHarc Compressed Archive
.ui	Developer	User Interface File
.uibak	Disk	UltraISO Backup Disk Image
.uif	Disk	Universal Image Format Disc Image
.uis	Settings	WindowBlinds User Interface Specification
.ukx	Game	Unreal Animation Package
.ulaw	Audio	Raw u-Law Audio File
.ulf	Data	Universal List File
.uls	Misc	NetMeeting User Location Service File
.ult	Audio	UltraTracker Module
.ulw	Audio	u-Law Audio File
.ulz	Data	USBlyzer Data Capture File
.umod	Game	Unreal Tournament Module File
.umx	Game	Unreal Music Package
.unauth	Text	SiteMinder Unauthorized Message File
.uni	Audio	MikMod UniMOD Module
.unity	Game	Unity Scene File
.unity3d	Game	Unity Scene Web Player File
.unk	Misc	Unknown File
.unknown	Misc	Unknown File Type
.unr	Game	Unreal Level Map
.unx	Text	Unix Text File
.uop	Game	Ultima Online Patch File
.upd	Text	Program Update Information
.update	Data	ISAPI Update File
.upk	Game	Unreal Engine 3 Package
.upoi	Data	iGO Points of Interest File
.url	Web	Internet Shortcut
.urt	Image	Utah Raster Toolkit File
.usa	Game	Unreal Saved Game File
.userprofile	Settings	Norton Antivirus User Profile File
.usf	Audio	Nintendo 64 Music File
.usflib	Audio	Nintendo 64 Song Library
.usr	Data	FileMaker Pro Database File
.usx	Game	Unreal Static Meshes
.ut2	Game	Unreal Tournament Map
.ut2mod	Game	Unreal Tournament 2003/2004 Module File
.ut3	Game	Unreal Tournament 3 Map File
.ut4mod	Game	Unreal Tournament 2004 Module
.utc	Game	Bioware Creature File
.utf8	Text	Unicode UTF8-Encoded Text
.utx	Game	Unreal Texture Package
.utxt	Text	Unicode Text File
.uu	Encoded	Uuencoded File
.uud	Encoded	UUDecoded File
.uue	Encoded	Uuencoded File
.uvf	Data	Uncertain Value Format
.uvx	Game	Unreal Tournament 2003 Saved Game
.uw	Audio	Unsigned Word Audio File
.uwf	Audio	UltraTracker Wave File
.uwl	Data	User Word List File
.uxx	Game	Unreal Tournament Cache