AFAIK:

*_at3_* are Sony ATRAC3 -> used with mdl
some *_ra8_* are Cook (?) despite it says:
	*_ra8_* were rp atrac3 samples (donno, ?)
atrac3.zip is a .acm and .inf file (support over dll ???)

I don't need those but maybe it helps to improve rp
support for mplayer...