Как использовать iFileDialog в проекте VC ++ 2010, преобразованном из VC ++ 6.0?

I am able to use a FileSaveDialog (Common Item Dialog) in a VC++ 2010 app like this:

IFileDialog *pFileDialog;
HRESULT hr = CoCreateInstance(CLSID_FileSaveDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pFileDialog));    

but when I put this code into my project that has been converted from VC++ 6.0 to VC++ 2010 I get the following error:

"error C2787: 'IFileDialog' : no GUID has been associated with this object"

I also get a red squiggle under the IID_PPV_ARGS macro and the float-over error:

"operand of _uuidof must have a class or enum type for which _declspec(uuid('...')) has been specified"

I am NOT using the Common Language Runtime Support (/clr) in either project.

How do I associate a GUID with my object?