Powershell to decompress DEFLATE data

decompress.ps1

function extract($i, $o) {
    $i = [System.IO.File]::OpenRead($i)
    $o = [System.IO.File]::OpenWrite($o)
    $t = New-Object System.IO.Compression.DeflateStream($i, [System.IO.Compression.CompressionMode]::Decompress)
    $t.CopyTo($o)
    $t.Close()
    $o.Close()
    $i.Close()
}