u need to hex it bro.
Yellow = guideline where to find part to edit item attr
Green = edit item attr(permanent,trade,drop etc)
Red = guidline where to find part to edit item duration
Blue = where to edit item duration
-Item attr-
00= Weapon/Armor/Item Permanent non trade/drop/sale
16 = Weapon/Armor/Item Permanent able to trade/drop/sale
20 = Weapon Expiry non trade/drop/sale
27 = Weapon Expiry able to trade/drop/sale
30 = Costume Expiry non trade/drop/sale
35 or 37 = Costume Expiry able to trade/drop/sale
20 = Item/Jewelry Expiry non trade/drop/sale
27 = Item/Jewelry Expiry able to trade/drop/sale
-Item Duration-
80 51 1E = 1 Day
80 F4 1B = 3 Days
80 97 1C = 5 Days
80 3A 09 = 7 Days
80 C6 02 = 15 Days
00 8D 27 = 30 Days
hex the item.isf decrypt it 1st & use Ran Editor
hope this helps