I've got the same problem. The game works for about 15-20 minutes before the error pops up. Sometimes the game minimizes by itself, but sometimes the game screen just freezes and I can't do anything besides hard reboot my computer. The only weird thing is that I don't even have the appid.txt file in the first place, so I can't even delete it.
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You have to run it as Admin first and it will give you the error. Go back into the game files and it'll be there. But from what I have experienced, and a few others as well, it still gives the same error.