to add pdf file as hypertext in FrameMaker file

I add a hypertext in a FrameMaker file using "message openfile reference.pdf" and save the file as pdf. However on click of the hypertext the launch file window is not popping up. The launch window is opening if I change the hypertext to "message openfile reference". 

Is there any specific command to launch pdf files from pdf  ( after saving the FrameMaker file as pdf) ?