Ejemplo C#
var xml = USLib.WebServices.Utilerias.FachadaUtileriasWs.GetDocumentoXml(rfcEmisor: "EMC160315TX7", rfcReceptor: "COMR850106QQA", uuid: "D1577001-0F2D-449B-BB63-223D91BFF6F4");
if (xml != null)
{
System.IO.File.WriteAllBytes(@"C:\D1577001-0F2D-449B-BB63-223D91BFF6F4.xml" xml);
}
else
{
//Xml no encontrado
}