If you're referring to a game modding tool, a level editor, or something similar, here are a few general suggestions:
If the game doesn't load your changes, delete any companion backup files (like SaveFile.es3.bak
An ES3 save editor is a utility—often web-based or standalone—that allows you to open .es3 files, which are usually stored in a JSON format. These editors allow you to bypass encryption and modify values like: Giving yourself "infinite" gold or money.
Now go forth, open that .es3 file, and become the master of your own digital destiny.