You only need to look here if you are writing a backend for
File storage which can be used by native backends.
Represents the surroundings of your app.
Image data for the icon.
Information about the integration passed to the use app each frame.
Options controlling the behavior of a native window
Information about the web environment (if applicable).
Abstraction for platform dependent texture reference
A place where you can store custom data in a way that persists when you restart the app.