Powershell function for unzipping files

punzip.ps1

function punzip( $zipfile, $outdir ) {
  If(-not(Test-Path -path $zipfile)){return "zipfile " +$zipfile + " not found!"}
  If(-not(Test-Path -path $outdir)){return "output dir " + $outdir + " not found!"}
  $shell = new-object -com shell.application
  $zip = $shell.NameSpace($zipfile)
  foreach($item in $zip.items())
    {
      $shell.Namespace($outdir).copyhere($item)
    }
}

# usage
# paramater 1 is path to zip file
# parameter 2 is directory to extract the archive
punzip ("c:\windows\temp\archive.zip") ("C:\windows\temp")