This article explains the role of Microsoft FrontPage server extensions in relation to your hosting account.
FrontPage extensions allow you to use the publication feature and dynamic page elements available in Microsoft's FrontPage software. You should only install the server extensions if you intend to use Microsoft's FrontPage software to create and upload your web site.
Important: If you install FrontPage extensions to your hosting account you will not be able to upload your files and manage your site using FTP.