I am not sure how a dual boot is related to this ... Maybe I didn't understand your question in the first place ?
You can always run XXHighEnd as a self contained audio player, might that be what you want ...
(and have HTPC stuff installed alongside)
?
As it isn't possible to use XXHighend as external audio player in XBMC,I was wondering if it is possible to create a dual boot system:
choose 1 = Win 7 / Vista or even Linux with XBMC
choose 2 = Win 7 with option to startop XXHighend.
But you say: I can use XXHighend anyway when creating XMBC, only not intergrated in XBMC as external player?
Thanks,