how to include paths of virtual folders

Hi,

I'm using the CCS - Project Explorer.

I create a virtual folder "Virtual_Folder"  then I copy    c:/Real_Folder/real_file.h     into the Virtual_Folder so both have the real_file.h

I'm adding via the project properties an include path ${PROJECT_LOC}/Virtual_Folder.

I notice that files.c  which #include "real_file.h"  - can't see it.

If I'm using    #include "c:/Real_Folder/real_file.h"    then they see it !

What is the difference and how can I include the  local Virtual_Folder path instead of the Real_Folder path ?

Thanks,

Eli