The fact that OLE superceeded DDE doesn't mean that you can control an application that provides a DDE interface using Win32::OLE. If the app only allows you to control it via DDE, you have to use DDE. You should be able to install Win32::DDE from http://www.bribes.org/perl/ppm/.

c:\> ppm
ppm> rep add bribes http://www.bribes.org/perl/ppm/
ppm> search Win32::DDE
ppm> install 1
[download]