FrontPage Extensions are special system files, which are required for websites built with Microsoft FrontPage in order to function efficiently on a web server. Without these files, your sites will still work, but some capabilities will be unavailable, that will immediately affect the experience of your site visitors. If FrontPage Extensions are present on the web hosting server, you will also be able to upload the site which you have created using your PC instantly and with no additional software such as some FTP program. You'll only have to type in the FTP sign in data for your hosting account and FrontPage will do all the rest, uploading or updating your files. Considering how easy it is to use FrontPage, you are able to start your worldwide web presence quickly even if you've never made a site before.