Rh10 - HTML Help - linking to pdf shows when generate CHM and 'view results' but not when double-click on CHM in project folder or in product help

I have several PDFs in Baggage Files that are linked to topics in the Table of Contents.  When I generate the CHM file and 'View Results' I am able to pull up/access the PDFs with no problem.  When I go into the project folder and just double-click on the CHM file, I cannot pull up/access any of the PDFs nor can I access them in the product help.  Any ideas?  Is a setting "off" somewhere in my project?

I am using RoboHelp 10.

Thanks!