How do I check if there is already an .sav file using plotscripting?
From OHRRPGCE-Wiki
You can do this, sort of. In a plotscript you can use the save slot used command to check whether or not a save slot is empty or used, and take action accordingly. So if you check all the save slots your game can ever use (slots 0-3 if you're using the OHRRPGCE's default save system) and none of them are used, then you can probably assume that there is no .sav file.