Oracle Forms

I have the following program unit that works in forms 6i using the win_api_environment.read_registry program unit.
l_filetype := WIN_API_ENVIRONMENT.Read_Registry
('HKEY_CLASSES_ROOT\'||l_extension, null, TRUE);

-- Get associated OPEN command e.g.
-- 'c:\win32app\msoffice\winword\winword.exe "%1"'
l_command := WIN_API_ENVIRONMENT.Read_Registry
( 'HKEY_CLASSES_ROOT\' || l_filetype
||'\shell\open\command'
, null, TRUE);

However, when I converted this to work with webutil by adding client_ to the win_api_environment, I get a no_data_found error.

In 6i, this returns the (default) value in the registry, if I change the null in both commands to '(default)', I still get no_data_found. If I insert a string value in the key I am looking at, it will return that key.

Basically, my question is how do I get the (default) value returned?

Thanks

Stephen