In the Desktop Items dialog you might select one of the icons and hit the Change Icon button.
Now just smack the Browse button, and pick whichever icon file you would prefer.
The IconFile line can be adjusted to point to a custom icon file.
If you are pointing to a .ico file you should change the IconIndex line to 0 instead.
you’re free to also set the default folder icon using this tool.
And then nudge the Open button and pick the icon file you want to use.
