Bug 314475 Advanced button not working again
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/CreateLinkedResourceGroup.java
URI uri;
		try {
			IPath path = Path.fromOSString(linkTarget);
			if (path != null && path.toFile().exists())
				return URIUtil.toURI(path);
			
			uri = new URI(linkTarget);
			URI resolved = getPathVariableManager().resolveURI(uri);
			try {
				EFS.getStore(resolved);
			} catch (CoreException e) {
				return URIUtil.toURI(path);
			}
		}catch(URISyntaxException e) {
			uri = convertToURI(linkTarget);
		}
		return uri;
	}
	private URI convertToURI(String string) {
		FileSystemConfiguration configuration = getSelectedConfiguration();
		if (configuration == null) {
			return URIUtil.toURI(string);
		}
		
		return configuration.getContributor().getURI(string);
	}