Ok, I have a problem with the MSDN documentation for the namespace Microsoft.Office.Interop.Excel. It states in the documentation in MSDN that the code in this namespace is not intended to be used by ones application directly but it’s code for supporting features in the .NET Framework.
Nowhere says what functionality this supports and what should we use to interact with Excel documents if not this. If you know what part of the .NET Framework they are implicitly talking about here, please, let me know. I’ve been searching for this for almost 4 months now.
Thanks in advance.

So I think they mean the actual implementation. It doesn’t say the same thing if you look at the _Application interface: http://msdn.microsoft.com/en-us/library/microsoft.office.interop.excel._application.aspx