CoSMOS Gamehacking Tool

I'm trying to learn how to change savegames, I saw here are also very good savegame editors available and I thought someone could help me. CoSMOS has a savegame editor but just for RPG Maker if I get it right.

So I have a .sav savegame file, how do I now find certain things? If I open it just with notepad it doesn't look good. So can I convert it to something readable an .xml for example? Or how can I find out in which format it is convertible?

Or should I attach a hex editor to the .sav and change something ingame, save it and look which offsets changed?

[Edited by Keygen123, 6/28/2018 5:38:13 AM]

The savegame editor is currently only for RPG Maker games. It is not possible to edit any other savegame files with it.