Usually it's highly-specialized industrial or lab equipment with either an embedded computer (oscilloscopes, waveform generators) or have a computer attached (CNC things.) These are things that usually cost 10^5 to 10^7 USD/GBP/EUR/whatever. (That said, these are also generally things that shouldn't be connected to a public network, anyway.)
There are a few old oscilloscopes kicking around my workplace that run Windows 98. They serve their purpose and upgrading them to even XP would be a good way of turning them into bricks that can play Minesweeper.