Enabling adobe reader plug-in for IE in 64bit application

Hi,

We have developed 64bit .net desktop application. We use embedded IE browser control to display webpages and pdf documents. I have enabled Adobe Reader plug-in through IE Settings --> Manage Add-ons. But still my PDF is opening outside of the browser. Is there any way to open the pdf within embedded IE browser control in a 64 bit application. 

Thanks

Srirangam K