I have a word document I want to parse with C#. There are plenty of tutorials out there, but I have a hard time deciding what library to use. I found the following dlls: 

1. Microsoft.Office.Interop.Word
2. Microsoft.Office.Tools.Word
3. Microsoft.Office.Tools.Word.v4.0.Utilities
4. COM Microsoft Word 12.0 Object Library
5. Open XML sdk

These are all I found on the web. Which one should I use? Which of those are obsolete?