Main » Quick Reference »

Data Formats and File Extensions: U

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'

.uaxUnreal Audio file
.ubAudio file (unsigned byte)
.uc2Compressed file archive created by UltraCompressor II (uc2.zip)
.ucnNew compressed file archive created by UltraCompressor II
.ucsUniversal Classification Standard Database file
.udcAcrobat Spelling file
.udfFilter (Photostyler)
.udlMS Data Link
.udsSierra Generations Family file
.ue2Encrypted file archive created by UltraCompressor II
.ufoUlead PhotoImpact Graphic file
.uhaUHARC Compressed Archive file
.uhsUniversal Hint System (binary file)
.uiEspire source code file (Geoworks UI Compiler)
User interface (Sprint)
.uifMagicISO Disc Image file
Long prompts for windows (WordPerfect for Win)
.uihEspire header file (Geoworks UI Compiler)
.uisWindowBlinds (Copyright Neil Banfield & Stardock.net, Inc.)
.ulUlaw audio file
.uldInformation about uploaded files (Procomm Plus)
.ultMusic (UltraTracker)
.umbBackup file (MemMaker)
.umdUniversal Media Disc file
.umfStockmoves, MOTEK BV
.umxUnreal music file
.uniUnimod music module (MIKMOD)
Datafile (Forecast Pro)
.unlGarmin Unlock file
.unqFax View file
.uns2Ultra Notes Backup file
.unxText file containing UNIX specific info
.updProgram update info
Update data (dBASE)
.upgFirmware Upgrade file
.upoCompiled update data (dBASE)
.upxULead Photo Express Saved Image file
.urlUniform Resource Locator (Internet shortcut)
.urlsGetRight URL List file
.usbD-Link FM Radio Update
USB Protocol Analyzer Trace
.userVisual Studio User Options file
.uspPrinter font with USASCII extended character set (PageMaker)
.usrUser database file (Procomm Plus - Turbo C++ tour)
.utfAOL Updating Files
.utlSound file
.utxUnreal Engine Texture file
Unicode file
.uuCompressed ASCII file archive created by UUDE/ENCODE
.uueCompressed ASCII file archive created by UUENCODE (uuexe515.exe)
.uvfCSV (comma separated value) format. Used by Netica
.uvrUlead Cool 360 Viewer file
.uwAudio file (unsigned word)
.uwlWordPerfect 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


Texting & Chat Abbreviations

From A3 to ZZZ this guide lists 1,500 text message and online chat abbreviations to help you translate and understand today's texting lingo. Read More »

List of Well-Known TCP Port Numbers

Port numbers 0 to 1024 are reserved for privileged services and designated as well-known ports. This list of port numbers  are specified in... Read More »

Computer Architecture Study Guide

Computer architecture provides an introduction to system design basics for most computer science students. Read More »

Network Fundamentals Study Guide

Networking fundamentals teaches the building blocks of modern network design. Learn different types of networks, concepts, architecture and... Read More »

The Five Generations of Computers

Learn about each of the five generations of computers and major technology developments that have led to the computing devices that we use... Read More »