try{
Runtime.getRuntime().exec("cmd /c start C://help.chm");
Desktop.getDesktop().open(new File("C://help.chm"));
}catch(Exception e){ System.out.println(" execption");};
Runtime.getRuntime().exec("cmd /c start C://help.chm");
Desktop.getDesktop().open(new File("C://help.chm"));
}catch(Exception e){ System.out.println(" execption");};