I asked this question on Godot Q & A:
Basically, my problem is that I want My executable file's icon to display my own custom icon instead of the default Godot icon. I learned that Windows executables come in bundles and now know that I should include icons of other sizes instead of just one.
How do I do this?
My problem is how I do this in Godot, not having found a means to edit the bundles in Godot.