The termed "Duped" pretty much means the item has been somehow copied by bugs/programs. The item creation..certain programs may make that possible...Not that I have any experience in this. Doing so, is stupid because you will get your cd key banned and guess what! you get the buy the game AGAIN!!!! you know how much fun that is.
But...With Neverwinter Nights you can make all the items you want and it takes few simple minutes to get a player to the max level. (unlike the grusome million hours to get an character to level 99 in Diablo 2) And the best of all!!!!!!!! wait for it........ YOU CAN MAKE SHINY ARMOR!!!!!! w00t w00t!!!!!!!!!

ok im getting really of topic here....