By default, Dreamweaver cannot read PHTML files. You can add the file type to the “Open in Code View” section of the preferences if you wish to have fast access, however you cannot view the file in design view if you do that. So if you use Dreamweaver (versions 4, MX, MX2004, 8, or 9, aka CS3,CS4) to design your sites, and you wish to open Magento’s Template files (they have .phtml extensions) in Dreamweaver, you can follow these steps to add support for .phtml and make Dreamweaver render PHP code (with coloring, hinting, et al) as well as allow you to see the design in code view if desired. Below are three steps to follow.*