Outlook Attachments opening up in ThinApp'ed Excel

Hi,

I have Office 2010 including Outlook, Word & Excel installed on the Base Image. I also have a ThinApp'ed version of Excel 2010, which has some specific application configuration settings.

When opening up an Excel attachment in Outlook, it opens up in the ThinApp'ed version of Excel, but I need it to open up in the Base Image version of Excel. What do I need to do?

Thanks