There is differing opinion on this…
I have been unable to successfully run Mach3 using the Parallel Port on a Win10, 64 bit PC (irrespective of any Win7, 32 bit emulation) so my conclusion was that it cannot be done.
Others disagree.
I stand to be corrected but to my knowledge no one has even proved that Mach3 can be used with the Parallel Port on a true 64 bit PC even if a 32 bit Win7 (or earlier) OS has been installed, so you may be the trail blazer.
Tweakie.