Many of these exclusive files come with Sub-Zero and Scorpion unlocked from the start, bypassing the need to beat the campaign first.
Here’s a useful, step-by-step post for anyone looking to get running on PPSSPP with an updated, exclusive file setup. mortal kombat shaolin monks ppsspp file updated exclusive
These aren't just for show. Performing them earns experience points to unlock new moves and combos. Many of these exclusive files come with Sub-Zero