This is a simple process. your data.grf is your main RO information/sprite/image/texture storage file. It's KINDA like a .zip file,but in a different format. Say I can run my patch client properly, as I connect through a proxy it always claims patch completed. I download them from the RO site and open my data.grf and merge the patch files. It's not hard concidering in iRO open beta we manually upacked these files using hex editors....not even going to exsplain that.