The easiest way to edit .sav files is with a game-specific editor. These tools provide a user-friendly interface that translates the file's raw data into readable fields.
Editing an actively open file can corrupt it. This guide assumes you are making a copy, editing it offline (while the program is closed), and then replacing it. How To Edit Active Sav File
Use Handle (Sysinternals) or Resource Monitor. The easiest way to edit
