Inserting a hyperlink to a PDF

I'm running RoboHelp 6 and having trouble in a project inserting a hyperlink to a PDF.  I've included the PDF in the Baggage File folder, but when generating a WebHelp layout the hyperlink won't work.  What's peculiar is that if I generate a Microsoft HTML Help layout (.chm) the hyperling to the PDF works.

I create the hyperlink as such:  Insert->Hyperlink, Link to: File ..., then select the pdf in the Baggage File folder of my project.  Like I said, works in Microsoft HTML Help layout, but not WebHelp.  When clicking on the link in the WebHelp project nothing happens.

TIA,

Tony