If the question is how to make a HD-usable version of a game that is not supposed to be I can't give you an answer, but two potential workarounds
You could give gibs' Tiny Launcher to be able to launch more WHDload games:
http://eab.abime.net/showthread.php?t=61210
Also, here is the list of games that can be natively installed to HD (with instructions when needed):
http://hol.abime.net/hol_search.php?N_hd=yes