No, the MySQLi extension is not compatible with Dreamweaver 8.
you will need to use Dreamweaver CS4 or above.
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.