Wondering if someone could help me out?

I would like to edit the attached Macro so that when you run it it gives an option window where the user can select which files they wish to export(at the moment its just a DXF or PDF)

I would also like to add IGES as a possible file type.

Im new to the API Solidworks so am learning as I go along by editing existing Macros but have hit a wall on how to add the IGES capability and then option menu for selecting which files you would like to export.

Can anyone take a look at what I have got so far and possibly give me further guidance/code?

Thanks