Yes, there is. Would I be right in assuming you are working with C++ projects? If so, you can use a method such as VCProjectEngineLibrary::VCPlatformPtr::Evaluate(), as in the example below (which retrieves the include folder configuration) from one of our add-ins:

 CString VsAutomationHelper::GetVcIncludeFolders(EnvDTE::_DTE* pDTE)
 {
     if (pDTE == NULL)
     {
         return _T("");
     }
     try
     {
         EnvDTE::_DTEPtr ptrDTE;
         pDTE->QueryInterface(&ptrDTE);

         EnvDTE::PropertiesPtr ptrProperties = ptrDTE->GetProperties( _T("Projects"), _T("VCDirectories") );

         VCProjectEngineLibrary::IVCCollectionPtr ptrPlatforms = ptrProperties->Item( _T("Platforms") )->GetObject();
         ATLASSERT(ptrPlatforms != NULL);

         if (ptrPlatforms != NULL)
         {
             VCProjectEngineLibrary::VCPlatformPtr ptrPlatform = ptrPlatforms->Item( _T("Win32") );

            _bstr_t bsFolders = ptrPlatform->GetIncludeDirectories();

            CString sIncludeFolders = OLE2CT( ptrPlatform->Evaluate(bsFolders) );
         }
         return sIncludeFolders;
     }
     catch (const _com_error& e)
     {
         UNREFERENCED_PARAMETER(e);
   
         ATLASSERT(false);
     }
     return _T("");
 }

Good luck!

Kind Regards,

   Anna-Jayne Metcalfe

   Software/Product Development Consultant,
   Riverblade Limited.
   http://www.riverblade.co.uk