[/7y3uK]

Все работает.

public static void main(String[] args) {
        try {
            Runtime rt = Runtime.getRuntime();
            Process pr = rt.exec("C:\\Windows\\notepad.exe " + System.getProperty("java.home") + "\\README.txt");
            int exitVal = pr.waitFor();
            System.out.println("Exited with error code " + exitVal);

        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
        }
    }