Starting w/ MSXML 6.0, for security reasons, the
ProhibitDTD property defaults to True, which will prevent the attached file from loading.
Some options:
1) Uninstall MSXML 6.0
2) Remove the DTD from the file
3) Tweak the Write XML action to set the ProhibitDTD property to False (see attached project)
In a future release, an option will be added to the Write XML action to configure the value used for the ProhibitDTD property.