Uhm... Now, this is an interesting question!
As a mac user, I'm working on MacOS and then I just create the Windows executable from my Win10 partition; so, I am far from familiar with the Windows environment.
I'll try to find out if's possible to build a 32 bit executable from a 64 bit environment...
I'll keep you posted! :)
(if anyone of those who read this post has the answer, I'd be very grateful for letting me know!)