Well you dont know how it works or you dont think that it works?
If you dont know how it works, the NPCDrops.tsm is the file you've to edit. Lets take a look at this example:
The first 1:1 is telling us wich npc id is going to be dropping the following items. (Its the first number(1), I've no idea why that second one is there. )Code:#Man drops 1:1 995:100 554:100
The 995:100 means that the npc is going to drop 100x995 (means 100 coins)
554:100 means that the npc is going to drop also 100x554 (I've no idea what 554 is)