[plt-scheme] Does DrScheme work well on windowx XP 64 bits ?

I don't know.

My guess is that the 32-bit version will work ok, because it doesn't
rely on anything special like kernel-mode drivers, but I don't recall a
report either way.

It might be possible to build a 64-bit version. There certainly would
be configuration issues, but those should be easy (e.g., making sure
the JIT runs in x86_64 mode). There might be bugs where the code
incorrectly assumes 32-bit sizes that change in 64-bit mode.

Matthew