32 & 64 Bit in one (Windows)?

Audio Plugins
1

I’ve successfully compiled a 64 Bit VST on Windows now.
Does one absoutely need to create 2 DLL’s on Windows for the same plugin if one wants 32Bit and 64Bit versions (unlike on Mac) ? Would it theoretically be possible to put everything into 1 DLL ?

2

Also, I suppose the 2 DLL’s will use the same 4-char codes as VST identifiers?

3

There is no equivalent of the macos fat binaries on windows, so you have to build two DLLs. Using the same VST id for both dlls , and keeping them in the same folder, is ok.