How to get the map author's handle?

I'm really curious to find out if there's any way to get the handle of a map's author. I'm not talking about maps that have banks (cause the solution then becomes very simple) but rather about those that don't.There has to be (at least that's my assumption) a file within the mpq of a map, that contains the handle. Several possibilities could be the "DocumentHeader", "DocumentInfo" and "DocumentInfo.version".
Does anybody have an idea?