Example of filtering off the Win32_AccountSID association class to convert a SID->User using only WMI

ConvertFromSID.ps1

function ConvertFrom-SID {
    param (
        [Parameter(Position = 0, Mandatory = $True)]
        [String]
        [ValidateNotNullOrEmpty()]
        $SID
    )

    $AccountSIDInstance = Get-CimInstance -ClassName Win32_AccountSID -Filter "Setting = 'Win32_SID.SID=`"$SID`"'"

    $Domain = $AccountSIDInstance.Element.Domain
    $Name = $AccountSIDInstance.Element.Name

    if ($Domain -and $Name) {
        "$Domain\$Name"
    }
}

# ConvertFrom-SID S-1-5-21-1578066767-49256976-3073566822-1011