DW Printer: remove "Microsoft Word - " from the beginning of the document name

I've set up a DW Printer configuration to automatically populate the Document Name field with, guess what, the document name!  However, whenever I use it from MS Word DW puts "Microsoft Word - " on the front of the name.  How can I tell it not to do that?  I just want the document name to be in the document name field, not the source application name as well.

Should be able to do a start after and put in Microsoft Word - . However, I believe this started with printer in DW7. But could be wrong. See attached picture. 

That would work if the document name was being read from a read-out area on the document but it's not, it's set as a dynamic entry.  The only options I have that pull text from the document name itself is FileName and FileNameWithExtension and they will both include "Microsoft Word - ".