Fixing Borderless Windows in Windows Server 2019 and Windows Server 2022

Starting with Windows Server 2019 someone at Microsoft apparently thought it was a great idea to make the various application-windows borderless, making it really hard to see the windows. Below is an example of two File Explorer windows overlapping, the arrow pointing to the top border of the window in front.

The Fix via PowerShell – Current User

Fixing the issue is quite easy, simply add a registry key the restores the behavior back to how it was in Windows Server 2016. Here is a PowerShell snippet that does it for you:

$RegistryKey = "HKCU:Control Panel\Desktop"
$Name = "UserPreferencesMask"
$Value = ([byte[]](0x90,0x32,0x07,0x80,0x10,0x00,0x00,0x00))
$Type = "Binary"
New-ItemProperty -Path $RegistryKey -Name $Name -Value $Value -PropertyType $Type -Force

Note: You need to log out and login for the setting to take effect.

The Fix via PowerShell – Default User for Offline Injection in WinPE

If you rather change it for all users, for example during the WinPE phase when imaging a device, you can load the default user registry and set the value there. Here is an example:

# Load the offline registry hive from the OS volume
$HivePath = "C:\Users\Default\NTUSER.DAT"
New-PSDrive -PSProvider Registry -Root HKEY_USERS -Name HKU
reg load "HKU\Tmp" $HivePath 
Start-Sleep -Seconds 5

# Updating default registry hive to show Windows Borders
$RegistryKey = "HKU:Tmp\Control Panel\Desktop"
$Name = "UserPreferencesMask"
$Value = ([byte[]](0x90,0x32,0x07,0x80,0x10,0x00,0x00,0x00))
$Type = "Binary"
New-ItemProperty -Path $RegistryKey -Name $Name -Value $Value -PropertyType $Type -Force

# Cleanup (to prevent access denied issue unloading the registry hive)
Get-Variable Registry* | Remove-Variable
[gc]::collect()
Start-Sleep -Seconds 5

# Unload the registry hive
reg unload "HKU\Tmp" 

The Fix via PowerShell – Default User in full Windows

If you rather change it for all users, when a task sequence is in full Windows (no longer WinPE), you can also load the default user registry and set the value there. Here is an example (Thanks Rakesh for the script/comment):

# Load the online registry hive from the Windows volume
$HivePath = "C:\Users\Default\NTUSER.DAT"
New-PSDrive -PSProvider Registry -Root HKEY_USERS -Name HKU
reg load "HKU\Default" $HivePath 
Start-Sleep -Seconds 5

# Updating default registry hive to show Windows Borders
$RegistryKey = "HKU:Default\Control Panel\Desktop"
$Name = "UserPreferencesMask"
$Value = ([byte[]](0x90,0x32,0x07,0x80,0x10,0x00,0x00,0x00))
$Type = "Binary"
New-ItemProperty -Path $RegistryKey -Name $Name -Value $Value -PropertyType $Type -Force

# Cleanup (to prevent access denied issues when unloading the registry hive)
Get-Variable Registry* | Remove-Variable
[gc]::collect()
Start-Sleep -Seconds 5

# Unload the registry hive
reg unload "HKU\Default"

The Fix via Group Policy Preference

If using legacy Active Directory, you can also create a Group Policy Preference that sets the value. Create a new Group Policy and navigate to User Configuration / references / Windows Settings / Registry. Then add a Registry Item with the following settings:

• Action: Update
• Hive: HKEY_CURRENT_USER
• Key Path: Control Panel\Desktop
• Value name: UserPreferencesMask
• Value type: REG_BINARY
• Value data: 9032078010000000