Cannot install any levels

More Mac w/ wine problems; I cannot drag-install any levels no matter what I do. Is this related to wine, the Mac, or am I missing something?

EDIT: Crap, I just now realized there's a Browse option. ...The question still stands, though.
EDIT 2: Double crap, using that doesn't work; the entire game freezes and won't close unless I exit the terminal. I can't find any information on this.

I don't know how to fix your issue, but you might want to try the Level Extractor... But I can't find it anymore on this Forum. If you have Java, you could try my KS Java Editor, which includes a level extractor (Level -> Extract from .knytt.bin).

That sounds like it should work; I'll find and try that.