Acrobat Scripting Open EPS Files Failed

Trying to open am .EPS file using AcroPDDoc and it is not working.  Any ideas?

Using VS 2010

     Reference COM Object Adobe Acrobat 9.0 Type Library

C# code

     AcroPDDoc testDoc = new AcroPDDoc();

     bool c = testDoc.Open(filepath);

     string t = testDoc.GetInfo("Author");

I get nothing, even the boolean c is not even set.

What I am trying to do is find out what application was used to create the .EPS file (i.e. Illustrator C2, Illustrator C6, CorelDRAW x5, etc.)?

Any ideas?

Thanks,

Tom