How to get Windows 10 to open wav files in Audition CC

My agency just updated to Windows 10. I want emailed .wav files to open automatically in Adobe Audition CC. I can't find a way to make that happen. I can't even find a way to make it happen manually without first saving the .wav file and opening it in Audition CC. Before the update to Windows 10 it opened automatically in Audition CC. How do I get this feature back? What settings in Windows 10 or in Audition CC do I need to make?