Symptoms

Customer is using SmartForms containing View that has URL content control. The control is populate with SharePoint 2010 document URL at runtime. They have SharePoint configured so when one clicks on a document (doc, pdf, etc.) the file will open in the client program. However, they have been struggling to have this work from within the SmartForms. They are currently running IE 11, and have realized that when they open developer tools and change the document mode to IE 10, the opening of files works as expected.
 

Diagnoses

This is the expected behavior with IE 11.
 

Resolution

The following suggestion has been provided to resolve the issue:
-Modify the HTTP response headers on the smart forms runtime site.
-Previously the X-UA-Compatible had the values of IE=11, IE=10, IE=9, IE=8
-By removing IE=11 this forced the browser to open SmartForms in IE 10 not edge.