I haven't needed to do this myself so this answer is just a stab in the dark but I'd think you would have to install a version of Windows on your hard drive and boot up with it to play the other games you talk off
If you look at the game details on its case it will say if it works with Windows or Mac (not sure how you check if they are on steam or origin etc)
When you buy some games you have to buy the Windows or Mac version so I doubt you can get a Windows version to work on Mac easily
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