#_U_EXTENSIONS

.U    Unreal Tournament game file (Digital Extremes & Epic Games Unreal Tournament/UT).
.U32  User Code for 32-bit Windows Authorware applications (Macromedia Authorware 6).
.UAE  Amiga Emulator configuration file (WinUAE).
.UBX  RP file (Axure RP Pro).
.UCD  User Code for 16-bit Windows Authorware applications (Macromedia Authorware 6).
.UCG  Ulead CG Infinity project file (Ulead CG Infinity).
.UDF  Universal Disc Format CD ISO image file (CD burner applications).
.UENC UltraEdit Encrypted file (IDM Computer Solutions' UltraEdit).
.UEZ  ULEAD Exported presets from previous versions (ULEAD Cool 3D 3.5).
.UFO  Ulead File for Objects file (Ulead PhotoImpact).
.UFRAW UFRaw ID file (UFRaw).
.UI   Qt Designer file (Digia Qt Creator).
.UI   UltraISO image file (EZB Systems UltraISO).
.UID  User Identity file (ICQ2000a).
.UIF  UIF image file (Power Software's Free Any Burn).
.UIS  Ulead Image Sequence file with RIFF header (Ulead's VisualStudio 6, Ulead Video Paint and other Ulead products).
.UIS  User Interface Style file = proprietary-stored-in-plaintext "WindowBlinds Advanced Visual Style format" (Stardock's WindowBlinds, ObjectDock and other Stardock products).
.ULW  AU audio file (QuickTime 7.7.2).
.UML  Unified Modelling Language diagram file (Diagramming/modelling software).
.UMX  Unreal Music Package file (Ian Luck's XMPlay module/mod player).
.UOL  Ulead Object Library (Ulead PhotoImpact 7).
.UP2  Ulead Plug-in list file (Ulead Cool 3D, Ulead Web Razor).
.UPD  UPD file = URL of currently playing audio track (Steven Mayall's MusicBee).
.UPD  Ulead Board Plug-in file (Ulead Cool 3D, Ulead Web Razor).
.UPF  UGH Burner Project File (A.L.U.Tech's UGH Burner).
.UPI  Ulead PhotoImpact Image file (Ulead PhotoImpact and other Ulead applications).
.UPP  Ulead Program file (Ulead Systems' MediaStudio 5).
.URA  URL Address Book file (GBCS' URL Address Book).
.USF  USF subtitles file (Video audio applications).
.USK  UltraSkins file (UltraCo UltraPlayer).
.USR  Custom User database file (Corel PerfectExpert Assistant).
.UTF8 UTF-8 encoded text file (Many applications).
.UTX  Unreal Tournament 2003 Texture file (Digital Extremes & Epic Games Unreal2003).
.UU   UUencoded file (Archivers, Usenet newsreaders, browsers, and other applications).
.UUE  UUencoded file (Archivers, Usenet newsreaders, browsers, and other applications).
.UV   UVIEW file (Cinegraphics' UVIEW and other applications).
.UVP  Ulead Video Paint project file (Ulead Video Paint).
.UVS  UltraVisualization file (UltraCo UltraPlayer).