[simon83]

I wonder if you could get into legal trouble if you start to re-distribute calc.exe from older Windows version, as a free download. Probably yes, but it would look so ridiculous if MS lawyers would go after a random person doing that.

[wila]

The thing is that your Windows 8/7/Vista/XP versions of calc don't even run on Windows 10. The only thing you can run is the Calculator Plus that was released for XP. Of course Microsoft did remove the download for that one.