How do you migrate an existing VS.Net 2002 / DirectX9 solution to
VS.Net 2003?

I recently upgraded my development hardware, and at the same time
switched from VS.Net 2002 to 2003 and from the original DirectX 9.0 to
the summer 2003 SDK update.

Now I've got a problem trying to open my project that was created in
VS.Net 2002: the DirectX namespaces are inaccessible, and it seems
there's no way to add them again.

I can create a new DirectX project: the references are there and the
namespaces appear fine.

When I open the existing project, the DirectX references appear with a
yellow warning icon.  I can remove them, but when I try to add them
again, there are no DX-related components in the list in the Add
Reference window.

So I removed VS 2003, installed VS 2002, added VS 2003 side by side,
and reinstalled the DX SDK (hoping it would be integrated in both
versions), but it remains the same: no DirectX in VS 2002 at all, and
in 2003 it's only available for new projects.