cls
Write-Host APP-V_OSRemoval will backup OSD files to OSDBAK folders
Write-Host then will remove references to OS from each file.
Write-Host 

$CurrentDir=Read-Host "Enter the root directory for all OSD files"
$OSD = $CurrentDir + '\*.OSD'
$BAK = $CurrentDir + '\OSDBAK'
$FLAG = $CurrentDir + '\OSDFlag.txt'

#Flag this directory to preserve backups
If ((test-path -Path $FLAG) -ne $true)
{
	Get-Date | New-Item -Path $FLAG -type "file"
} Else {
Write-Host 
Write-Host OSDParser has already been run once. Running again
Write-Host will overwrite OSD backup files.
Break
}

# Make Backup of OSD's 
$DIR = get-childitem $CurrentDir -include *.osd -recurse -Force
foreach ($file in $DIR)
{
	$FileNow = $file.PSParentPath + '\OSDBAK'
	If ((Test-Path -path $FileNow) -ne $True)
	{
		New-Item ($FileNow) -type directory
	}
	Copy-Item $file.PSPath $FileNow
	# Remove references to OS
	(Get-Content $file) -notmatch '<OS VALUE' | Set-Content -path $file
}

# Finished
Write-Host
Write-Host Finished. All OSD files in all
Write-Host subdirectories parsed.