Make a save in an unused slot so your original save doesn't get jacked, Navigate to your Steam install directory / userdata / the folder with todays date that is a string of numbers, another folder with todays date with a string of numbers / the folder named remote and the data000x.bin files are your saves in this folder.
Isn't this just for the Vita version? Via Homebrewed Vita with Vita Save Manager installed and then the data.bin file extracted which can be used to edit the save file or does this work on the PC version somehow?
