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Funny to see this question here a few weeks ago did I see someone link this https://m.youtube.com/watch?v=Nqxjfp4Gi0k&feature=youtu.be
The video shows how to create a salt based pcm (phase change material). You can also buy packs like these but I thought it seemed more fun to create it myself, so it will be my summer project when the heat is not barrable. I think Putting it under a cap would do wonders.
I want to add to what the others said. Usually I just add windows programs/games to steam as none steam game. that has been the easiest way to do it for me. I have very few games that isn’t on steam so it is nice to be able to add them together with the rest with the correct categories and such.