"win32" would be nice to distinguish between that and "win64". However, if both 32-bit and 64-bit executables are likely to be packed into a same file, then ".pd_win32" as a suffix wouldn't make that much sense anymore.
on win64, the 64bit system libraries are in a folder called "system32" and the 32bit libraries are in a folder called "syswow64". so maybe we should stick to that and start using win64 for now, and update to to win32 later on..(im pretty sure discovering that was the moment i decided i couldnt handle windows any longer)