It's not webstart giving that error, but Windows' compatibility check is.
I am actually able to reproduce it, but I don't think it is a problem with Profit updater, since it neither uses flash, nor invokes a browser.
EQ2MAP updater, I think, uses the IE browser engine to display the changelog messages in the main window. And it uses the standard IE for your operating system. Microsoft deploys both 32bit and 64bit IE with Vista64, but EQ2MAP automatically invokes the 64bit one. As flash is not available for 64bit browsers yet, it will display this error messages.
When you press the launch button, the EQ2MAP updater is launched in the context of the Profit updater, so Windows will display this error message for Java WebStart instead of the EQ2MAP updater itself. I have no idea though why it does not show up if you launch EQ2MAP updater by itself.
Easiest fix would be to let EQ2MAP updater launch the Profit Updater.
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