BTW: Before you compress the file with Smashbox, PLEASE make a copy and save it in a different place, just in the case that it doesn't work, and all your progress to be lost if you can't open it with PSA again DX
I've already extensively tested Smashbox's ability to compress the file. It goes off beautifully without a hitch every time. (short of the Usmash, the game seems to like the whip for some reason >_>)