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Forum Moderators: phranque
If you have FP, you could open the web live on the server, publish the site to your local PC, then add your pages and republish back to the server. Likewise, your friend could just add the pages you send him/her locally, and publish from there if you don't want to risk messing up the server extensions.
I have edited and uploaded pages with FP extensions and uploaded their modified versions without any trouble.
Its just another text file, you should be able to recognise the true HTML pretty easily.