Returned tuple from COM method doesn't include all outputs

I am accessing SolidWorks via COM using comtypes. I create a new application object as follows:
swApp=comtypes.client.CreateObject('sldworks.application')
To open files with this application, you use the OpenDoc6 method, which is as follows:
ModelDoc2 OpenDoc6(string FileName, int Type, int Options, String Configuration, [Out] int Errors, [Out] int Warnings) (taken from the api help files.
When I call swApp.OpenDoc6, the ModelDoc2 object is not returned. Instead I only get a tuple containing the Errors and Warnings.
I have possible solution, which might not necessarily be all that good:
If I change comtypes/**init**.py line 599 to use rescode (the return from the function) as opposed to outargs, then I get a tuple containing all three outputs. Not sure this would work for all COM libraries.
djm one five eight @ieee.org (where the numbers are really numbers) to ask questions of me.