Disable PDF handler switching

Disables the ability to change the specified default handler (PDF viewer).

The UI configuration does not set any key in HKCU. Instead, changing a setting invokes the installer which sets the key in HKLM. The default and application behavior varies depending on what is installed. A value of 1 disables the user's ability to change the default handler. Possible values include:
0 (or null): Allow the user to change the default viewer.
1: Don't allow the user to change the default viewer.

GUI mapping - Edit > Preferences > General > Select Default PDF Handler

Supported on: PDF-XChange Editor v5.5.312 or later
Registry PathSOFTWARE\Policies\Adobe\Acrobat Reader\11.0\FeatureLockdown
Value NamebDisablePDFHandlerSwitching
Enabled Value1
Disabled Value0