Hello Noel 1983,
Welcome to the
AudioDirector forum
I don't claim to have any particular expertise or vast experience here, but it seems your observation is correct from the VSTs I've checked.
Some VST plug-ins are specifically built for use with either 32-bit or 64-bit software. It is my understanding that applications may be unable to "bridge" the 32/64-bit divide without additional resources.
Only a small number of VSTs in my modest collection are specifically 32/64-bit but WE2 will only import 32-bit ones. AudioDirector won't import some VSTs (.dll) and offers "not 64-bit" as a possible reason.
As an example, here is a .zip file -
TDR VOS SlickEQ - containing a 32-bit & 64-bit version of the same VST (a simple EQ plugin). Only the .dll labelled "TDR VOS SlickEQ" - i.e. not "TDR VOS SlickEQ (x64) will import into WE2.
Perhaps other members with broader or different experience might have other advice.
PIX
PIX YouTube channel