Unfortunately, I can't say we are going to support FS9 on XP64, it's really such unusual combination that there are simply too few users that might justify additional support for it.
In FSX, initially (last year, when we did Orlando) we weren't compatible with 64 bit OS, but for FSX it was justified to make an investment and support 64 bit as well. Believe me, adding a new OS to the supported ones, does cost money, if only to have at least one dedicated machine to *test* if something works or not.
FS9 on 64 bit it's simply not a very common combination we are going to support.
About VHHH, it's not ours. There was a discussion about what scenery we might do next, and some suggested VHHH, but another user objected that since there's a good freeware one out there, it wouldn't make much sense.