If you save your Web site as an HTML file type (.html or .mhtml), you will not be able to edit it in Publisher the same way you can edit a Publisher file (.pub). To make changes to your Web site in Publisher, save a current version of your Web site as a Publisher file (.pub), and make your changes to the Publisher file. Then resave your Web site as either an .html or.mhtml file.

If you make changes to the Publisher file (.pub) version of your Web site, you need to republish your Web site in order for the updated version of your site to appear on the Web.