Are you downloading the zip file to your hard drive or are you trying to open it directly from the browser?
what program are you using to unzip the package?
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.