http://bugs.winehq.org/show_bug.cgi?id=20277
--- Comment #18 from Austin English austinenglish@gmail.com 2010-02-10 10:55:44 --- (In reply to comment #17)
This bug persists for me with wine 1.1.38. I do not have /usr/lib/winemp3.acm.so. The WINEDEBUG=+mpeg3 trick did not work for me. Oblivion is completely unplayable.
I am using wine on a 64bit Gentoo system, so this might also be a gentoo-specific bug. I will report this on the Gentoo bugtracker later. Perhaps you could tell me whether it is normal that /usr/lib/winemp3.acm.so is missing or not, so I can tell the Gentoo developers?
Presumably they're disabling mp3 support, possibly because of patent issues. Check is the '--without-mpg123' configure option is being used.