Using VS2010 C#

I am at a complete loss...

I have a vendors program to export data in a proprietary format into a CSV file.

I have about 20 disks and one of them has 255 such files...

I want to automate the process... Which was fairly straightforward *until* I needed to write the new file name into the file save box on the vendor's program.

I have the programs handle but can't seem to ask the right question(s).

I *think* I need a way to enumerate all the controls so I have a handle to use send message to.

But, as I said I am at a complete frustrating loss at this time.

Suggestions on what questions to ask would be most appreciated.

Thanks!