Letter U: Data Formats & File Extensions

Find data file formats and file extensions that start with the letter U, or view thousands of file extensions and file formats in the complete list.

With literally thousands of data file formats employed by Windows and Window-based apps, keeping track of all the file extensions employed by your software applications and programs can be quite a challenge. Fortunately, Webopedia’s Complete List of Data File Formats and File Extensions makes it quick and easy to sift through thousands of file extensions and data file formats to find exactly what you need. You can peruse the full list or search for data formats and file extensions based on the letter they start with from the table below.

Number Symbol 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 Full List

Data File Formats that Begin with the Letter ‘U’

.uax Unreal Audio file
.ub Audio file (unsigned byte)
.uc2 Compressed file archive created by UltraCompressor II (uc2.zip)
.ucn New compressed file archive created by UltraCompressor II
.ucs Universal Classification Standard Database file
.udc Acrobat Spelling file
.udf Filter (Photostyler)
.udl MS Data Link
.uds Sierra Generations Family file
.ue2 Encrypted file archive created by UltraCompressor II
.ufo Ulead PhotoImpact Graphic file
.uha UHARC Compressed Archive file
.uhs Universal Hint System (binary file)
.ui Espire source code file (Geoworks UI Compiler)
User interface (Sprint)
.uif MagicISO Disc Image file
Long prompts for windows (WordPerfect for Win)
.uih Espire header file (Geoworks UI Compiler)
.uis WindowBlinds (Copyright Neil Banfield & Stardock.net, Inc.)
.ul Ulaw audio file
.uld Information about uploaded files (Procomm Plus)
.ult Music (UltraTracker)
.umb Backup file (MemMaker)
.umd Universal Media Disc file
.umf Stockmoves, MOTEK BV
.umx Unreal music file
.uni Unimod music module (MIKMOD)
Datafile (Forecast Pro)
.unl Garmin Unlock file
.unq Fax View file
.uns2 Ultra Notes Backup file
.unx Text file containing UNIX specific info
.upd Program update info
Update data (dBASE)
.upg Firmware Upgrade file
.upo Compiled update data (dBASE)
.upx ULead Photo Express Saved Image file
.url Uniform Resource Locator (Internet shortcut)
.urls GetRight URL List file
.usb D-Link FM Radio Update
USB Protocol Analyzer Trace
.user Visual Studio User Options file
.usp Printer font with USASCII extended character set (PageMaker)
.usr User database file (Procomm Plus – Turbo C++ tour)
.utf AOL Updating Files
.utl Sound file
.utx Unreal Engine Texture file
Unicode file
.uu Compressed ASCII file archive created by UUDE/ENCODE
.uue Compressed ASCII file archive created by UUENCODE (uuexe515.exe)
.uvf CSV (comma separated value) format. Used by Netica
.uvr Ulead Cool 360 Viewer file
.uw Audio file (unsigned word)
.uwl WordPerfect User Word List file

Recommended Reading: An Introduction to Data File Formats and Their File Extensions

Number Symbol 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 Full List

This article was last updated on April 15, 2011

Webopedia Staff
Webopedia Staff
Since 1995, more than 100 tech experts and researchers have kept Webopedia’s definitions, articles, and study guides up to date. For more information on current editorial staff, please visit our About page.

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