Get-SidFromHex.ps1

function Get-SidfromHex {
    param
    (
        [string]$Sid
    )
    $ByteSid = New-Object Byte[] 150

    for ($i = 0; $i -lt $Sid.Length ; $i += 2) {
       $ByteSid.Set(($i/2),([Byte]::Parse($Sid.Substring($i, 2), [System.Globalization.NumberStyles]::HexNumber)))
    }
    New-Object System.Security.Principal.SecurityIdentifier($ByteSid,0)
}