https://bugs.winehq.org/show_bug.cgi?id=56940
--- Comment #6 from Louis Lenders xerox.xerox2000x@gmail.com --- I tried follow code path in current shell32, and maybe the troubles is caused by the trailing space in the filepath: "...vs_setup_bootstrapper.exe "
(PathFileExistsDefExtW (L"vs_bootstrapper_d15\vs_setup_bootstrapper.exe ",191)
If I strip that space manually away with a hack, the installer works again. But that needs some testing first for I guess PathFileExistsDefExtW