John,
You can use the Adobe Extension Manager CS6 to convert the mxp files to zxp.
Look under the Tools menu.
Dennis
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.