import java.io.File; import java.lang.reflect.Field; import net.minecraft.client.Minecraft; public class Start { public static void main(String[] args) { try { // set new minecraft data folder to prevent it from using the .minecraft folder // this makes it a portable version Field f = Minecraft.class.getDeclaredField("field_6275_Z"); Field.setAccessible(new Field[] { f }, true); f.set(null, new File(".")); } catch (Exception e) { e.printStackTrace(); return; } // start minecraft game application Minecraft.main(args); } }