It looks like the engine does not have a place for bows.
It has for shield, armor, pants, boots.
So you can not create only projectile arcs (arrow)
Should have a place to equip the bow and arrow that will be used
How is it in the picture
http://vignette2.wikia.nocookie.net/tibia/images/4/4e/FlashInventory.png/revision/latest?cb=20120627005154&path-prefix=en