i think they use linux

I saw some windows 7. Hope their AV is up to date.

go to Zvezda - the bridge, do a 180, click the blue play button for "Internation Space Station command center".

Go to 'node 3 - tranquility'. There's some windows and a mechanical arm outside.

The middle left part of the station is where the Cupola module is. There are some windows there. Click Node 3 on the map to see it.