Param($PackageDir,$TargetVhd,$mountdir)
if ($PSBoundParameters.Count -ne 3)  { Write-host "Error: -PackageDir <path> -TargetVhd <path> -MountDir <path>" ;exit }
If ( -not (Test-Path $packagedir)) { Write-host "Error: -PackageDir <path> does not exist." ;exit }
If ( -not (Test-Path $targetvhd)) { Write-host "Error: -TargetVhd <path> does not exist." ;exit }
If ( -not (Test-Path $mountdir)) { Write-host "Error: -MountDir <path> does not exist." ;exit }

$packages = (Get-ChildItem -Path $packagedir| where {$_.extension -eq ".msu"} | Sort Name | %{$_.FullName})

$success = $true
if ($packages.Count -gt 0){
  DISM /Mount-Image /Imagefile:$targetvhd /index:1 /mountdir:$mountdir
  #if (Test-Path -Path $mountdir"\Windows") {
  if ($LASTEXITCODE -eq 0) {
    foreach ($package in $packages){
      DISM /Add-Package /Image:$mountdir /PackagePath:$package
      if (!($LASTEXITCODE -eq 0)) {
        $success = $false
        Write-Host "Failed: "$package
      }
    }
  } else {
    "Failed: DISM /Mount-Image"
    "Failed: VHD(x) was not updated."
    exit
  }
  if ($success) {
    DISM /Unmount-Image /mountdir:$mountdir /Commit
    if (!($LASTEXITCODE -eq 0)) {
      DISM /Unmount-Image /mountdir:$mountdir /Discard
      "Failed: DISM /Commit, VHD(x) was not updated. "
      exit
    } 
  } else {
    DISM /Unmount-Image /mountdir:$mountdir /Discard
    "Failed: DISM /Add-Package, VHD(x) was not updated."
    exit
  }
}
exit