   SDK Symbol files?
  I'm unsure what the SDK symbol file download is for.  What is a symbol file and how would I use it?Thanks,Devin   
  For a little introduction to symbols, check out decent CodeProject article.  In a nutshell, debug symbols indentify function calls within an application or dynamic library, allowing you to see a full call stack.You can get debug symbols by using Microsoft Symbol Server (also covered in that article).  You can download the DXSDK ones separately if you wish, from the standard download page.   