i know win 98 is not really designed to support open gl in applications (i am NOT talking about games here) but i think there is a patch that helps the situation. sadly i cannot remeber what it is or excatly what it does (either enables open gl or uses direct 3d instead - i cannot remeber.
btw - my client does NOT have the option of changing to win 2k - so no "change os" replies plz. thanks