How to make custom folder into msvs2008prj.

Hi all.
I need to add my custom folder to the msvs2008prj project.

I have to collect all .gob files into a virtual folder and apply a 
custom compiler command.

Normally a msvs2008prj project is maded so

project
   Source Files (.c,.cpp)
   Header Files (.h)

I need to add gob folder.

project
   Source Files (*.c,*.cpp)
   Header Files (*.h)
   GOB Files (*.gob)

Any idea?

Greetings,
   MZ

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