https://bugs.winehq.org/show_bug.cgi?id=48959
--- Comment #4 from Zebediah Figura z.figura12@gmail.com --- The answer is that MSI doesn't; the installer (or more accurately, the framework it uses) sets VersionNT64 manually. But it only does that if we actually report 603—which we weren't—and then it depends on some registry keys we don't currently set to retrieve the real version. I've sent some patches.