Because almost everything industrial runs windows because that's what the devs of those companies were most familiar with since MS-DOS days and evolved organically over time to modern versions of Windows due to great backwards compatibility and platform familiarity.

Right but typically embedded systems run Linux, because while Windows has great compatibility on x86 it's virtually worthless outside of that.

Those aren't embedded systems though, but mini PC computers. And embedded systems often run bare metal C code, not always Linux, especially for spindle/servo control where they get their commands from that PC.