AutoCAD 2015 - Cannot Open File From Explorer

Any ideas why I can no longer open a DWG by double-clicking the file from Windows Explorer (Windows 7 x64)?  I have Building Design Suite 2015 installed, and this has never been a problem with 2013 or 2014.  If I right-click the file and select "Open With...", AutoCAD DWG Launcher is selected (See attachment).  However, when I double-click the file, nothing happens.  If I change the default program to acad.exe, the file will open, but multiple files open multiple instances of AutoCAD.

Originally, I installed 2015 next to 2014, but since having the problem, I completely uninstalled all Autodesk products and installed 2015 "clean".  Any ideas what might be happening?

Thanks

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