Nice, at least sort of. Errno 13 is at least permission denied so we're onto something here.

I guess that could be explained by e.g. some other user owning the /Users/test folder other than test user himself, assuming it was the test user which was used to try launching RWR, or the active account not having write permission in /Users/test. Any chance it's something like this?

I suppose the recommended location for games to store data on Mac OSX is under ~/Library/Application Support/ rather than directly under the home dir the much I've read into the topic today, so I could very well change the location there instead of using the location RWR happens to use with Linux.

I guess the ownership or write permission is different for /Users/test/Library/Application Support in your case compared to the home dir /Users/test? If they are similar then making the change wouldn't directly help you.

I made sure the ownership was in the test account.

Still no luck