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[aruaru]

mus/ast -- either one or a collection of EA asf files.
Read this post to extract: hxxp://www.nfscars.net/forum/showpost.php?p=216198&postcount=67
That sx.exe can convert from .wav to .asf as well.. which is just one entry in the mus/ast file.

abk files are probabbly indexes into the mus/ast files. Don't know much about them... but assuming that each ast/mus only contains one audio track, it shouldn't be much of a problem.