lockswitcher.ps1

param(
    [parameter(Mandatory=$false,Position=0)]
    [string]$pic = 'Lock'
)

# When using, the file names must change.
# if the filename exists at the Network location and the Temp location, it is assumed the script already ran.
# To run again simply change the file names or delete the Temp location's contents.
# Designed this way to not download pictures, and wait for script every reboot.


# *** Network location of file - Somewhere Domain Users (and Domain Computers?) read access.
# *** Use "PSScriptRoot" to use the same location as script file.
    $networkLocation = "$PSScriptRoot"
    
# *** Local Location to store the lockscreen pictures, note this isn't where windows reads the lockscreen. It's just a temp location.
    $tempLocation    = 'C:\Lockscreen'

# Path for the registry keys that we're going to set
	$PersonalizationRegistryKeyPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\PersonalizationCSP"
	
# If the network files can't be reached, exit.
if( (!(Test-Path -Path "$networkLocation\${pic}.jpg")) -or (!(Test-Path "$networkLocation\${pic}.png")) ){
    Exit
} ELSE {
    
    # If the temp location doesn't exist create it.
    if(!(Test-Path -Path $tempLocation)){New-Item -Path $tempLocation -type Directory}

    # If the files do not exist copy them down then set as Lockscreen, else exit.
    if( (!(Test-Path -Path "$tempLocation\${pic}.jpg")) -or (!(Test-Path -Path "$tempLocation\${pic}.png")) ){
        Remove-Item -Path "$tempLocation\*.*"

        Copy-Item "$networkLocation\${pic}.jpg" -Destination "$tempLocation\${pic}.jpg"
        Copy-Item "$networkLocation\${pic}.png" -Destination "$tempLocation\${pic}.png"

        takeown /f C:\Windows\Web\screen 
        takeown /f C:\Windows\Web\screen\*.* /R
        icacls C:\Windows\Web\screen /grant Administrators:F /T /C

        takeown /f C:\ProgramData\Microsoft\Windows\SystemData
        takeown /f C:\ProgramData\Microsoft\Windows\SystemData /R /D Y
        icacls C:\ProgramData\Microsoft\Windows\SystemData /grant Administrators:F /T /C
        Remove-Item -path "C:\ProgramData\Microsoft\Windows\SystemData" -Recurse -Force

        $windowsLocation = 'C:\Windows\Web\Screen'

        $images = 'img100','img101','img102','img103','img104','img105'
        $images | % {
            Copy-Item -Path "$tempLocation\${pic}.jpg" -Destination "$windowsLocation\${_}.jpg" -Force
            Copy-Item -Path "$tempLocation\${pic}.png" -Destination "$windowsLocation\${_}.png" -Force
        }
		
	}
	if(!(Test-Path $PersonalizationRegistryKeyPath)) {
       
			New-Item -Path $PersonalizationRegistryKeyPath -Force | Out-Null
		}
		
	# Create new itemproperties or set them if they already exist
	New-ItemProperty -Path $PersonalizationRegistryKeyPath -Name "LockScreenImageStatus" -Value "1" -PropertyType DWORD -Force | Out-Null
    New-ItemProperty -Path $PersonalizationRegistryKeyPath -Name "LockScreenImagePath" -Value "$tempLocation\${pic}.jpg" -PropertyType STRING -Force | Out-Null
    New-ItemProperty -Path $PersonalizationRegistryKeyPath -Name "LockScreenImageUrl" -Value "$tempLocation\${pic}.jpg" -PropertyType STRING -Force | Out-Null
	
    Set-ItemProperty -Path $PersonalizationRegistryKeyPath -Name "LockScreenImageStatus" -Value "1" -PropertyType DWORD -Force | Out-Null
    Set-ItemProperty -Path $PersonalizationRegistryKeyPath -Name "LockScreenImagePath" -Value "$tempLocation\${pic}.jpg" -PropertyType STRING -Force | Out-Null
    Set-ItemProperty -Path $PersonalizationRegistryKeyPath -Name "LockScreenImageUrl" -Value "$tempLocation\${pic}.jpg" -PropertyType STRING -Force | Out-Null
}