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"Every File Extension in the World"

This is a list of file extension names or suffixes that indicate the format or usage of a file and a brief description of that file extension. In general, if you have the program that uses that file extension, that program can be used to open or otherwise use the file. To find more information about particular files visit FILExt.

Many people have contributed to this list and we thank them! If you know of file extensions that should be added to this list, please e-mail us and we'll add them.

File Extension Listing for "U":

Browse File Extensions Alphabetically:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #


	U		Subsampled Raw YUV Image
	UAP		User agent profile (Used by wireless telephony applications)
	UB		Raw unsigned byte (8-bit) data
	UC2		Compressed archive (UltraCompressor II)
	UCN		New compressed archive (UltraCompressor II)
	UDB		Off-line application file used with Rockwell’s Ultraware software
	UDB		Microsoft Works file
	UDB		PINO 3-Server File
	UDB		Windows 2000 Uniqueness Database File
	UDF		Image filter (Photostyler)
	UDF		Unique Database (Microsoft Windows NT)
	UDW		Raw unsigned doubleword (32-bit) data
	UE2		Encrypted archive (UltraCompressor II)
	UFO		Object file (Ulead)
	UG		Drawing file (AutoCAD and others)
	UHS		Binary file (Universal Hint System)
	UI		User interface file (Sprint)
	UI		Espire source code (Geoworks UI Compiler)
	UIF		Long prompts for Microsoft Windows (WordPerfect for Windows)
	UIH		Espire header file (Geoworks UI Compiler)
	UL		Audio file (ULAW)
	ULAW		(CCITT G.711) audio (US Telephony)
	ULD		Uploaded file information (Procomm Plus)
	ULT		Music module (MOD) (UltraTracker)
	UMB		Backup file (archive) (MemMaker)
	UNC		Files and Settings Transfer Wizard Output Folder (Note: folder format)
	UNI		Datafile (Forcast Pro)
	UNI		UniMod music module (MOD) (MikMod)
	UNX		Text file (Unix specific information)
	UPD		Updated program data (dBase)
	UPD		Updated program data (Generic)
	UPI		Program file (ULead Photo Impact)
	UPO		Compiled updated datafile (dBase)
	UPX		Saved Image file (ULead Photo Express)
	URF		Universal radar format (Radar ViewPoint)
	URL		Internet shortcut file (Universal Resource Locator)
	USA		Unreal II Savegame File
	USE		Source Integrity file (MKS)
	USP		Printer font w/updated USACII extended character set (Pagemaker)
	USR		Audit trail file (Pro/Engineer)
	USR		User database file (Turbo C++)
	USR		User database file (Tour)
	USR		User database file (Procomm Plus)
	UU		Compressed ASCII archive (UUDE/ENCODE)
	UU		UU-encoded file
	UUE		UU-encoded file
	UUE		Executable compressed ASCII archive (UUDE/ENCODE)
	UW		Raw unsigned 16-bit) datafile (Word)
	UWF		Wave file (UltraTracker)


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Browse File Extensions Alphabetically:	A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

Current file name extensions and definitions as of 7/9/2009: 3526

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