Hi,
I was able to reproduce this issue. the bug has been logged in our bug base and the fix will be included in our next dot release.
Meanwhile, i have attached a file with the fix to this issue. Please download and extract the zip file and replace your local file at (make sure to have Dreamweaver closed):
C:\Program Files\Common\Adobe\Installers\[Adobe Number]\Adobe Dreamweaver CS4\Configuration\Commands\