Bows of Sharpness?

[Starshine_Monarch]

Does the spell Weapons of Sharpness affect ranged weapons like bows and javelins? Whether it does or not, what does the spell do to weapons that are already Armor Piercing? For instance, if you'd cast it on a commander with a Sword or Axe of Sharpness, or will it not affect Weapon items like Destruction won't destroy Armor Magic items?