Select Export Coordinate System Through API

[MJDavis]

I have a macro to save x_T/PDF versions of files to a specific location. The macro works fine in that the right files get saved in the right places. The question is how do I change which coordinate system to use for export?

Manually, it is a simple switch in the export dialog options, but I cannot find any API calls for changing it, only one that returns the name of the current coordinate system. Any suggestion on how to change this parameter?

Thanks,

- Mark