Yes - I did the following as recommended by Adobe
"To make Reader the default PDF handler after installing Acrobat, find and run ADelRCP.exe in elevated mode. ADelRCP.exe is Acrobat’s PDF handler program for Windows.To make Reader the default PDF handler after installing Acrobat, find and run ADelRCP.exe in elevated mode. ADelRCP.exe is Acrobat’s PDF handler program for Windows"
After running ADeIRCP.exe, it set the default to Adobe Reader for that session logged in as Administrator. After making those changes I have shut the Image down and cloned it. Users logging in to that Clone, has Adobe DC Pro as the default PDF handler.
There must be some setting that is defaulting all new users on that PC (Image) to Adobe DC.