XP Mode Application to use Host IE8/Outlook

I have a client that I just installed 2 new PCs with Windows 7 Pro and enabled XP mode for both of them so they could run a legacy application. The legacy application runs perfectly in this setup, but one function inside of it opens up a webpage to show a generated PDF file. When it launches the webpage, it is using the IE6 install and the Adobe Reader X install from the XP Mode machine. When a user attempts to send a copy of the PDF document, they are presented with a setup wizard for Outlook Express from the XP Mode machine. What I would like to happen is when they initiate the function in the program, that it would open the webpage in the Host OS IE8 and use the Adobe Reader X install from the Host OS as well. That way when a user wants to send the PDF file, it will use the Outlook 2007 install on the Host OS as well. Does anyone have any suggestions on how to configure this, or would this need to be something written inside of the legacy application? Please help me out. Thank you.

The guest OS knows nothing about the outside world really, and visa versa:/ But maybe if the PDF was saved instead to a shared folder between the guest and host and a script was running on the host to auto open PDFs dropped into the shared folder it may be close...

Though I would first simply update the guest OS to us IE8 and the latest PDF viewer at least. Then maybe set up mail on the guest for send only if they really want to be able to send the pdf by mail though the reader. Though no local copy would be saved on the host unfortunatly.