Were you able to activate the extension? Which version of the extension are you running?
Also, make sure that you have extension manager and dreamweaver closed when deleting the WinFileCache.
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.