It appears there is no clean (easy) way in PowerShell to extract a compressed archive that is password protected. Booo!
After much searching it seems the easiest way involves downloading and installing the free and Open Source 7Zip.
This then makes the solution very easy…
$7-ZipPath = "C:\Program Files\7-Zip\7z.exe" $zipFile = "passwordprotectedtest.zip" $zipFilePassword = "Foo" & $7-ZipPath e -oC:\ -y -tzip -p"$zipFilePassword" "$zipFile"