Hiya,
In reference to Dreamweaver URL rewriting...
Select "Preferences" form the "Edit" menu, then select/highlight "Code Rewriting", then locate the "URL Encoding" section and select "Do not encode special characters". That should keep DW from messing with your URLs.
I would suggest that you turn off all code rewriting in DW to be safe. Writing HTML code by hand is always best but DW can be a helpful tool at times if you know its strengths and weaknesses.
Anyway, hope that helps someone...
Regards,
SF