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FrontPage adds a LOT of code that isn't necessary, hence the dejection of the application. The fact that it is a M$ product doesn't help, I'll admit.
But, best thing to do if I were you, is to give it a try. Make a copy of the original theme.html file, and edit the copy in FrontPage. If ther results are to your taste, why worry about what we think of the application?
Herko