REGEDIT4
[HKEY_CURRENT_USER\Control Panel\Desktop]
"MenuShowDelay"="0"

Runtime.getRuntime().exec( "regedit -r testRegedit.reg" );

 import  java.io.ByteArrayOutputStream;
 import  java.util.Enumeration;
 import  java.util.prefs.*;

 public   class  PropertiesInRegistry
{
   static  Preferences prefs = Preferences.userRoot().node( "/ru/java/myProgram" );

   static   void  fillRegistry()
  {
     for  ( Enumeration e = System.getProperties().propertyNames(); 
e.hasMoreElements(); )
    {
      String key = (String) e.nextElement();

       if  ( key.startsWith("user.") )
      prefs.put( key, System.getProperty(key) );
    }
  }

 static   void  display()
  {
     try 
    {
      String keys[] = prefs.keys();

       for  (  int  i =  0 ; i < keys.length; i++ )
        System.out.println( keys[i] + ": " + prefs.get(keys[i], "---") );
    }
     catch  ( BackingStoreException e )
    {
      System.err.println( "bla bla bla: " + e );
    }
  }