YES, I am aware that you can quit out of this or any other application by pushing Alt-F4. Thank all 500 of you for pointing that out, but it's completely beside the point, which is that it's a comically poor interface design that you shouldn't HAVE to bypass by forcing the application to quit and possibly messing up your machine with partially loaded files in memory.

And yes, I am aware that all you have to do on the PS3 or Xbox versions is to push the power button. You do not need to be the 401st person to post that. (less info)