While there is no official "all-in-one" graphical save editor for Batman: Arkham Knight
If you are trying to make your own editor using Python or C#: batman arkham knight save editor
Locate Save Data: Usually found in your Steam user data folder or the Documents/WB Games directory. Run Tool: Load the .sgd file into the editor. While there is no official "all-in-one" graphical save
Green-Bat Savefile Manager: Available on GitHub, this tool helps you backup and swap saves for the entire Arkham series without manual folder diving. batman arkham knight save editor