Este Mod abre uma janela de Chat ao usar o item ( O mesmo não some ). Serve para todas as plataformas.

Para alterar a HTML a abrir, altere o destaque em vermelho.
Para alterar o item, altere o destaque em azul.
Vá em gameserver/handler/itemhandler e crie o arquivo Item.java

Código:
package com.l2jfree.gameserver.handler.itemhandlers;

import com.l2jfree.Config;
import com.l2jfree.gameserver.handler.IItemHandler;
import com.l2jfree.gameserver.GameServer;
import com.l2jfree.gameserver.cache.HtmCache;
import com.l2jfree.gameserver.model.actor.instance.L2PcInstance;
import com.l2jfree.gameserver.network.serverpackets.NpcHtmlMessage;
import com.l2jfree.gameserver.handler.IItemHandler;
import com.l2jfree.gameserver.model.L2ItemInstance;
import com.l2jfree.gameserver.model.actor.instance.L2PcInstance;
import com.l2jfree.gameserver.model.actor.instance.L2PlayableInstance;
import com.l2jfree.gameserver.handler.itemhandlers.Item;



/**
 * @author Cobra
 *
 */
public class Item implements IItemHandler
{
        private static final int[] ITEM_IDS = { 10639 };

        public void useItem(L2PlayableInstance playable, L2ItemInstance item)
    {
              if (!(playable instanceof L2PcInstance))
                 return;
              L2PcInstance activeChar = (L2PcInstance)playable;
               int itemId = item.getItemId();
              
           if (itemId == 10639)
       {
                String htmFile = "data/html/Teleport/myhtm.htm";
                String htmContent = HtmCache.getInstance().getHtm(htmFile);

                        NpcHtmlMessage infoHtml = new NpcHtmlMessage(1);
                        infoHtml.setHtml(htmContent);
                        activeChar.sendPacket(infoHtml);
       }
    }
    public int[] getItemIds()
    {
        return ITEM_IDS;
    }
}
Vá no arquivo gameserver/handler/ItemHandler.java

Código:
                registerItemHandler(new SummonItems());
                registerItemHandler(new TransformationItems());
                registerItemHandler(new WorldMap());
+               registerItemHandler(new Item());

Creditos : Cobra.