I have followed your instructions, and am at the point where Launchbox displays a grid of all my Vassal games(over 600), and when I click on any one, I see the 'Play' button, which launches my chosen game.
However, at the moment, I cannot see ANY of the artwork. Is there an easy way to extract the artwork from ALL my games at once? Also, could you run through how I can add the whole library, using your XML file?