Help! Visual Studio help opens SQL Server Books Online

I'm experiencing another niggle with VS2005, on two separate development machines.

I have VS2005, SQL2005 and MSDN library installed. When I open help in VS2005, it launches SQL Books Online. I can't find any way to persuade it to open up MSDN library instead, or to use this for the contextual help.

What am I missing?

UPDATE: The answer came via Scott Hanselman's blog - turns out this is a known bug, resolved as "By Design". Hmmm.

UPDATE: I've downloaded the "MSDN Library for Visual Studio 2005" version. This seems to integrate well, and has a better search facility.