ARDC-CL-000050 - Adobe Reader DC must disable the ability to change the Default Handler.
Information
Allowing user to make changes to an application case cause a security risk. When the Default PDF Handler is disabled, the end users will not be able to change the default PDF viewer.
Solution
Configure the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \Software\Policies\Adobe\Acrobat Reader\2015\FeatureLockDown Value Name: bDisablePDFHandlerSwitching Type: REG_DWORD Value: 1