In this link i came across the following statement
You can add an enchantment to the Wuuthrad adding to its power. The enchantment will not be listed; it will continue to say, "Especially deadly to elves," it will, however, have the enchantment. Soul trap (for instance) works; the charge level is available and applies to the enchantment. (Not sure if this is a bug or purposely allowed.)
Does this mean i can add any enchantment to the wuuthrad? I did try.I recently purged the axe of burning and i have that enchantment but i am not able to use that enchantment on the wuuthrad.