There’s still things like that on my workplace today. I think there’s some older, rarely used CNC with Win98 on the controller. We just keep spares around when they break, but that’s cheaper than replacing the whole machinery. Also there’s some XP stations running software for an industrial machine which would cost quarter of a million to replace. Some of those need access to network drives and such but they live in a strictly isolated VLAN.

And, as far as I’ve told at least, there was no option at any point to upgrade just the computers on those things. It’s always the whole assembly line or whatever they’re connected to. There’s not many companies willing to throw hundreds of thousands every 3-5 years to replace equipment which working just fine.