Hey Andrew I'm currently working in integration of gretl with C#. The most sense solution to me was implementation P/Invoke. I have done some implementation, but nothing solid yet. Concept is to call [DllImport(gretlPath, CharSet = CharSet.Unicode)] public static extern IntPtr datainfo_new(); And then call that function in program. Look at next link: http://msdn.microsoft.com/en-us/library/aa288468%28v=vs.71%29.aspx Hope you have more luck than I. Have a nice day. Simon 2011/7/21 Andrew Postarnakov <apostarnakov(a)gmail.com&gt; -- LP Simon