Did your .sav file come from a game that was written using a private header?
The game should be written using your "private template file" (template file which was injected with your private header) so that the resulting .sav file will contain the private header.
(I'll add this somewhere in my guide)
Save files (.sav files) are dependent to their respective game's headers. If your .sav file was backed up from a game that was using a public header,
re-writing that game using a private header will result to the game not recognizing your save file.
Though this is based on what I have currently read, I will look further into editing the headers of .sav files to match their games.
as of now, I recommend you keep that .sav file somewhere safe
Thanks for contributing!
will edit soon