Dreamweaver determines the server model from the current document you are working with. Do you have a PHP page open when you try to access teh DataAssist Wizard?
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.