I mean it is difficult, but it is not easy. You need the itemtype editor, (See the topic: BusterBlade and TwinDragonRing). To convert the itemtype.dat to .txt copy the names of items within your itemtype, then take the parts of the ItemMinIcon and MapItemIcon and etc ... Follow the steps in the topic. You add that to the 5065 version, you need to add the names, str, agi, max and min atk in the table called : (I think itemtype) in Navicat.
Don't flame , please
Tip: Change to the 5017 version