Information
Windows Server 2019 File Explorer shell protocol must run in protected mode.
GROUP ID:V-205872
RULE ID:SV-205872r991589
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.
Solution
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'.