In notepad I entered
"C:\Program Files\Stardock\Object Desktop\IconPackager\IconPackager.exe" /apply "C:\Program Files\Stardock\Object Desktop\IconPackager\Themes\Magic\Magic.iconpackage"
And saved it as Magic.cmd
Dragged it to the startup folder.
Logged out, switched user and logged back in.
Most, but not all icons on desktop applied the suite. None of the folder Icons did.
Resizing the desktop refreshed all the icons and they could be resized and keep the icon set.
Resizing the folder icons only showed the magic icons in small sizes. The larger icons showed the Vista default.

So close . . but no cigar.
I am using Vista Business in this test.