Dreamweaver allows you to set the default image editor for the different image types. make sure that you have Fireworks set as a primary editor for the image extension you have on the page.
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.