A user defined Icon is not installed on Desktop or program listing.
The Icon can be seen in Java control Panel, but.
Install a link does not work from Java control Panel neither by .jnlp command:

        <icon kind="default" href="TacMarkFilled512.png"/>
        <icon kind="splash" href="TacMarkFilled512.png"/>

Not even Java coffee Cup ist installed, it Displays a plain white sheet.
try:
http://www.tacticalsailing.com/gametips/order/license-key.html
"Start_here"