Ok, i had the exact same problem but you need to use the java one.
{npcid, dropitemid, amount, rarity}
Npcid - The id of the npc
Dropitemid - The name of the item you want it to drop
Amount - Say if you wanted to drop coins make this 1000 and it will drop 1k
Rarity - 0 = Drop all the time, 100 = Extremely rare drop, Inbetween (2-99) work the same way but if its 50 or higher it will become rarer to get.
Example: {1, 995, 1000,1} - This will make a man drop 1,000gp everytime its killed, because the rarity is set to 1.
So add that code or whatever to the java fil, and it will drop