How do I invoke WordPerfect X3 from Forms 10g using CLIENT_OLE2?

 We are trying to convert Forms 6i modules to 10g, and these modules have DDE commands to invoke WordPerfect X3 and execute some macros. 
I tried using following options

client_ole2.create_obj('WordPerfect.Application');

client_ole2.create_obj('wpwin13.Application');

Any help will be greatly appreciated.

Thanks
Bhavana