The following code is line 22 of Make.bat: if "%Platform%" == "X86" (
I tried `echo %Platform%` in VS2017 x86 native Tools Command Prompt, the result is "x86"(not "X86"). If it's a mistake, the attached patch adds the changes.
Hmm, on the 32bit build VM I get this:
C:\Program Files (x86)\Microsoft Visual C++ Build Tools>echo %Platform% X86
C:\Program Files (x86)\Microsoft Visual C++ Build Tools>
Which explains why everything works in the production builds. Note that that system is VS 2015 though, but the 64 bit builds are VS 2017 iirc.
Given that 32 bit Windows builds will be dropped soon, I'm inclined to leave this as-is for now.