also, when downloading the extensions, the browser may give you the option to save it or open it, make sure to select the option to save it to your computer, o not open the MXP file until it has been downloaded and saved to your computer.
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.