| 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) |
| UDF |
Unique Database (Microsoft Windows NT) |
| UDF |
Image filter (Photostyler) |
| 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 |
Espire source code (Geoworks UI Compiler) |
| UI |
User interface file (Sprint) |
| 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) |
| UNI |
UniMod music module (MOD) (MikMod) |
| UNI |
Datafile (Forcast Pro) |
| UNX |
Text file (Unix specific information) |
| UPD |
Updated program data (Generic) |
| UPD |
Updated program data (dBase) |
| 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) |
| USE |
Source Integrity file (MKS) |
| USP |
Printer font w/updated USACII extended character set (Pagemaker) |
| USR |
User database file (Procomm Plus) |
| USR |
Audit trail file (Pro/Engineer) |
| USR |
User database file (Turbo C++) |
| USR |
User database file (Tour) |
| UU |
UU-encoded file |
| UU |
Compressed ASCII archive (UUDE/ENCODE) |
| UUE |
Executable compressed ASCII archive (UUDE/ENCODE) |
| UUE |
UU-encoded file |
| UW |
Raw unsigned 16-bit) datafile (Word) |
| UWF |
Wave file (UltraTracker) |
