A 32-bit DLL like MSS32.DLL should in fact work on Windows Vista x64 by a
32-bit program. It sounds like there's some kind of subtle compataiblity
problem here.

Downloading random DLLs off the Internet is in generally a very bad idea.
You really have no idea what the code is doing or if it's even really from
the person who you think wrote it. Many DLLs are 'side-by-side' versioned,
which is why you are getting wierd errors about missing entry points when
downloading random DLL off the internet for that game.

Have you contacted the game publisher and reported the problem?

--
Chuck Walbourn
SDE, XNA Developer Connection

This posting is provided "AS IS" with no warranties, and confers no rights.