Bug 46393 [RCP] Lost nature icon on project
N20031111 start fresh workspace, create a Java project ==> missing nature icon "J"
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/registry/MarkerImageProviderRegistry.java
String id;
		String markerType;
		String className;
		String imagePath;
		ImageDescriptor imageDescriptor;
		IConfigurationElement element;
		IPluginDescriptor pluginDescriptor;
		IMarkerImageProvider provider;
	}
/**
 * Initialize this new MarkerImageProviderRegistry.
 */
public MarkerImageProviderRegistry() {
	class MarkerImageReader extends IDERegistryReader {
		protected boolean readElement(IConfigurationElement element) {
			if (element.getName().equals(TAG_PROVIDER)) {
				addProvider(element);
				return true;
			}
			
			return false;
		}
		public void readRegistry() {
		    readRegistry(Platform.getPluginRegistry(), PlatformUI.PLUGIN_ID, IDEWorkbenchPlugin.PL_MARKER_IMAGE_PROVIDER);