Configuration Options File not found... will be created on apply (no replies)

Running W7 64 with MySQL Workbench 5.2.40CE

MySQL 5.5.16 service running on same machine.

Clicking on "Options File" in Admin results in error (cannot find the my.ini file).

Seems workbench is pointing to the default location for the wamp install; I have relocated my.ini

Changed:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\wampmysqld

from:
ImagePath: c:\wamp\bin\mysql\mysql5.5.16\bin\mysqld.exe wampmysqld
to:
c:\wamp\bin\mysql\mysql5.5.16\bin\mysqld.exe --defaults-file="D:\Documents\Application Data\MySQL\Wampserver\my.ini" wampmysqld

Where is Workbench getting the location of my.ini and how can I change it to the correct location?

Thanks for your help--
Sam