Definitely go for a dialog box.
Revised patch attached.
Sorry, but I have to reject this patch.
The MessageBox output takes no account of the fact that it is being displayed in a proportional-width font, and as a result comes out impressively mangled.
As the reality is that the command line options are really only for a very few advanced users, I don't think that providing easy access to the help is of sufficient urgency to justify taking the quick but ugly-hackish route.
Max.
