I'd recommend renaming them first, or at least the ones where the number starts with an 8: it seems that the game doesn't always handle whose well. A save needs to be labeled Slot_[number].save in order for it to be read, with the number being an eight-digit hexidecimal (as in, it uses digits 0 to 9, then a to f, then back to 10). The save files with a .verx on the end are the automatic backups; delete the .verx extension, and those can be loaded as well.