right there is bag, floor and char screen , i call this interface which you will find the number to in items.wil
then there is the actually character in game. i call this char :P - this will be in weapon.wil hum.wil and graphics under human and weapon
you get the idea now say you wanted to add a wep from graphics go into graphics and then put the number .wil in fld_shape eg: 100, then put 5 in the fld_STDmode , then for the bag image find the number image you want using hh8 looking in the stateitem.wil eg : 3546 andput that in fld_imageindex
hope this helps