code: public ImageDescriptor getCUResourceImageDescriptor(IFile file, int flags) {
  		Point size = useSmallSize(flags) ? SMALL_SIZE : BIG_SIZE;
  		return new VdmElementImageDescriptor(
  				VdmPluginImages.DESC_OBJS_CUNIT_RESOURCE, 0, size);
  	}
docs: Returns an image descriptor for a compilation unit not on the class path.
  The descriptor includes overlays, if specified.
  
  @param file
  the cu resource file
  @param flags
  the image flags
  @return returns the image descriptor