You can open the wizard window with "File -> New -> Project" and right-click between the icons, click on "Edit global registration script" and remove the
if (PLATFORM == PLATFORM_MSW)
from
if (PLATFORM == PLATFORM_MSW)
RegisterWizard(wizProject, _T("win32gui"), _T("Win32 GUI project"), _T("GUI"));
save the file and restart C::B.