Well I have it opening views, pics and text resources now. At least, some of them. About half of them seem to be corrupt (SCI Studio VGA doesn't show these). The resource map format must be slightly different or something... many of the resources don't point to anything valid. Including all the sound resources, which is why SCI Studio VGA doesn't show any (at least with SCI0-SCI1.1 it lists the sound resources it finds).
Does LSCIDump let you extract resources? Does it find any sound resources?
(incidentally, it's not accidental that SCI STudio VGA opens these files, it appears to have explicit support for "LSCI (On-Line SCI)")