Hey there New Mac user here, and I think that I may have somehow shut off Rosetta, for my new MacBook refuses to open PPC files. When I doubleclick these PPC files (such as mactheripper,) the icon opens up in dock, and then shortly after, it disappears, and the app does not open. I tried looking through system prefs, but couldn't find anything about Rosetta. Some help please? How do I return Rosetta to default?