http://www.gateway2000.com/support/custserv/glossary/fileformat/u.htm (Amiga Plus Extra No. 5/97, 05/1997)| .uc2 | Ultra Compressor II format. Data compressing archiver with separate graphical shell. Can create multivolume self-extracting archives. | |
| .urt | Utah Raster Toolkit format. Native raster file format of the Utah Raster Toolkit, a rich source of bitmap manipulation tools and source code. | |
| .uu, .uue, .uud | uuEncode, uuDecode. Converts binary data to text for transmission over email or Internet news. |
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