Extract-Zip.ps1

function Extract-Zip ($zipFile, $directory = ".\") {
    if ($directory -is [string]) {
        $directory = Get-Item $directory }

    if ($zipFile -is [string]) {
        $zipFile = Get-Item $zipFile }

    $zip = (New-Object -ComObject shell.application).NameSpace($zipFile.FullName)
    $destination = (New-Object -ComObject shell.application).namespace($directory.FullName)

    if ($directory.PSIsContainer) {
        $destination.CopyHere($zip.Items()) }
}