(if (eq (delivery-value :console) t) nil :default)
Windows only: The name of a file containing the icon to use, in Windows
(meaning no icon -- not recommended except for console applications) or
(which uses the icon from the LispWorks image).
Note: to achieve the same effect on Mac OS X, do not pass
but put your delivered image in a suitable application bundle which contains the application icon. See the examples in the LispWorks library directory