: While not a traditional "offline" save editor, this in-game tool allows you to modify items, health, and currency in real-time, which then carries over into your save file. It requires REFramework to run. Source: REFramework on GitHub PC Save File Location
To edit or back up your files, navigate to: C:\Program Files (x86)\Steam\userdata\[YourSteamID]\2050650\remote\win64_save . How to Use a Downloaded Save