Public Sub TestCert()
    Dim myHTTP as New ServerXMLHTTP60
    Dim myURL as String

        ' Open the connection to the secure server
         myHTTP.Open "GET", "https://server/finalpath", False

        ' Attempt to set the correct client certificate
        ' I have also tried just the friendly name as well as
        ' LOCAL_MACHINEMycert friendly name'
        myHTTP.SetOption 3, "CURRENT_USERMycert friendly name"

        ' Send request fails with "A certificate is required ..."
        myHTTP.Send
    End Sub

Dim apiConnection As New WinHttp.WinHttpRequest

' Set the authentication settings
apiConnection.SetClientCertificate "mycert"

apiConnection.Open "Get", "https://localhost:8443", False
apiConnection.Send