Convert SID to User Name using PowerShell

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Create a SecurityIdentifier object and translate into a NTAccount:

    1:  $objSID = New-Object System.Security.Principal.SecurityIdentifier 

    1:     ("S-1-5-21-3496554487-1900509739-3140548133-500")

    2:  $objUser = $objSID.Translate( [System.Security.Principal.NTAccount])

    3:  $objUser.Value