File Explorer shell protocol must run in protected mode.
The shell protocol will limit the set of folders that applications can open when run in protected mode. Restricting files an application can open to a limited set of folders increases the security of Windows.
Value Type: REG_DWORD Value: 0x00000000 (0) (or if the Value Name does not exist)
Fix Text (F-26622r465732_fix)
The default behavior is for shell protected mode to be turned on for File Explorer.
If this needs to be corrected, configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> File Explorer >> "Turn off shell protocol protected mode" to "Not Configured" or "Disabled".