Description of the problem:

The Printer Driver does not launch the default viewer after printing and does not open the Output Folder

Solution:

The problem is Symantec Endpoint Protection, it was blocking the BuMAppNT.exe from being executed.

The printer driver uses the BuMAppNT.exe to start an application or open the output folder.

Make sure you add the  \windows\system32\BuMAppNT.exe as trusted application to your virus scanner.