// Create a File instance of an existing file
File file = new File(args[0]);
// Get large icon
sun.awt.shell.ShellFolder sf = sun.awt.shell.ShellFolder.getShellFolder(file);
Icon icon = new ImageIcon(sf.getIcon(true));
System.out.println("type = " + sf.getFolderType());
// show the icon
JLabel label = new JLabel(icon);
JFrame frame = new JFrame();
frame.getContentPane().add(label);
frame.pack();
frame.show();