What's this error file?

@Jeansoo I have a new macbook pro with the exact same AMD card as you, but I haven't had any issues with graphics in my game. (I did get the message about the card being unsupported but didn't need to edit the .sgr files or anything.) I played on the mac side for a few months before recently Bootcamping (for the express purpose of getting out from under Cider's onerous limit), and I've very happy with my card's performance on both sides of the partition. I know each computer performs a little differently; one simmer's experience might not be replicated for another. Still, if you want to compare graphics settings, I'd be happy to do so.