Check if PDW Writer has a COM object, probably not.

Another approach is accessing the main menu of PDF Writer from VFP through API calls. It works with Adobe Reader, so there's a chance this may work for PDF Writer.

VFP code sample (membership required)
Accessing Adobe Reader 7.0 main menu from VFP application
http://www.news2news.com/vfp/?example=495

FindWindow
GetMenu
GetMenuItemCount
GetMenuItemID
GetSubMenu
GetWindowText
IsMenu
IsWindow
SendMessage