Frodev It doesn't matter where it leads. That's the whole point of having virtual roots like res:// or user://. The OS will provide some valid writable path somewhere in the appropriate place for user data. It is not the path of Godot executable as OS doesn't even know where that is. Godot doesn't install or register itself to the OS.
Just use user:// and don't worry about where it is. It will likely be in different places on different machines. If you need to manually check the files while developing, print the user path form within Godot using globalize_path()
and look there, as I mentioned earlier.