Updating a Windows Service..

I needed to update mysql to use the old authentication mechanism...
http://dev.mysql.com/doc/refman/5.0/en/old-client.html

This involved adding some command line parameters to mysqld when it starts to use the old authentication mechanism. Unfortunately the Windows Services tool doesn't allow this.

Thanks to http://illiniguy.wordpress.com/2006/03/17/updating-a-windows-service/

regedit to

\\HKEY_LOCAL_MACHINE\SYSTEMCurrentControlSet\Services\___YOUR_SERVICE_NAME___

and edit away...