If I remember correctly, the save has variables for how many enemies of each type you've killed, so if you can find those and set them all to at least 1 then you should theoretically unlock all the girls. It's what I did more than a few versions ago, and it seems to still be unlocking even the new ones as I carry over my save.I think a save equivalent to that has already been posted. Thanks anyways though. Im sure there is a way to unlock all the girls through modifying the save files but i dont have knowledge with that kinda thing so im kinda helpless.