I was looking the stats for this site earlier and saw that someone had come here having searched for “dreamweaver 8 ftp password registry”.
I can’t be certain, but I suspect who ever it was had lost or forgotten their FTP password and was hoping to recover it from Dreamweaver. I was in the same position a couple of months back and found this online Dreamweaver Password Recovery tool. It’s very easy to use, full instructions are on the site.