Unreal Tournament Class Package
3.7 | 31 Votes
What is a U file?
Contains settings used by Unreal Tournament; stored within the Unreal System directory, i.e. "\Unreal\System\Engine.u;" may be replaced with custom class packages.
Programs that open or reference U files
AU Audio File
3.3 | 9 Votes
Audio container format typically used to store ?-law encoded audio data; introduced by Sun Microsystems and also used by MusicKit for the NeXT operating system; contains a header that includes six 32-bit words, an optional information section, then the audio data.
AU files typically use the .AU extension.
Programs that open U files
Subsampled Raw YUV Image
2.7 | 7 Votes
Y, U, and V files can be built back into their original PPM file using the yuvsplittoppm utility.
NOTE: The ppmtoyuvsplit and yuvsplittoppm programs are part of netpbm, a Unix-based graphics package.