Hello @james-lawrence, this issue should be brought to the attention of the game developer.
Developer of this game some times ago promising a Linux port but... after all they not deliver it. I mean they pack game inside WINE bottle and push it on Steam (without any testing) but for many Linux users this game simple wont launch or launch but is complete unplayable because of many graphics issues - like this http://steamcommunity.com/sharedfiles/filedetails/?id=276585806 After all developer not fix it, or even not try fix it and just simple only remove Linux icon from Steam but Linux depots is still here. So thats why you see it in your Linux library. If u want play it, just install basic WINE and install this game. Don't use this broken wine port.
havent had any desire to play it in years, its just clutter in the library now. i'll reach out to them... but i doubt they'll do anything.
Nothing extracted yet.
build: Jul 17th 2017 at 23:10:56
distro: arch linux
client beta: no
check for updates: yes.
issue:
as it says on the tin: Eador Masters of the Broken world shows up in my library with steamos + linux selected. even though it is windows only.