GPO tool

Group Policy made searchable

A free ADMX browser or comparison tool for IT administrators. Search policies, find registry keys, and see exactly what each setting writes to the Windows Registry. Or compare two GPO backups to see exactly what has changed between them.

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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 the setting via the UI invokes the installer which sets the key in HKLM. The default 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

Registry Information

VendorAdobe
ProductAdobe Acrobat Reader DC ADMX File
CategoryAdobe Acrobat Reader DC › Preferences › General
Applies toComputer Configuration
Supported onUndefined
Registry Key[HKLM]SOFTWAREPoliciesAdobeAcrobat ReaderDCFeatureLockdown
Value NamebDisablePDFHandlerSwitching
TypeREG_DWORD
Enabled value1
Disabled value0