convert doc to pdf

param (
    [string]$source = $(Throw "You have to specify a source path."))


$extensionSize = 3
if ($source.EndsWith("docx")) {
  $extensionSize = 4
}


$destiny = $source.Substring(0, $source.Length - $extensionSize) + "pdf"
$saveaspath = [ref] $destiny 
$formatPDF = [ref] 17


$word = new-object -ComObject "word.application"
$doc = $word.documents.open($source)
$doc.SaveAs($saveaspath, $formatPDF)
$doc.Close()