PowerShell Extract Zip Files

function Expand-ZipFile([string]$File, [string]$Destination) #The targets to run.
{
    $Shell = new-object -com shell.application

    # Get the name of the Zip file
    $Zip = $Shell.NameSpace($File)

    #Expand/Extract each file from the zip file
    foreach($Item in $Zip.items())
        {
            $Shell.Namespace($Destination).copyhere($Item)
        }
}

Expand-ZipFile –File "C:\file.zip" –Destination "C:\tempfile"

Reference: http://www.howtogeek.com/tips/how-to-extract-zip-files-using-powershell/