The Main FAQ states that attempting to strike a bow does not use the Strike a Weapon rules, but instead uses the rules for Strike a Held Object.
Under the rules for Strike a Weapon in the PHB, it states that weapons add their enhancement bonus to hit points and hardness, can only be damaged by a weapon of equal or greater enhancement, and use an opposed attack roll mechanic.
Under the rules for Strike a Held Object, there is an attack roll against the AC of the object using the owner's Dex and Deflection bonuses.
Since a bow, according to the FAQ, does not use the rules for Strike a Weapon, which include the hardness, hit points, and immunity-to-lesser-weapons rules, a +5 Longbow can be destroyed by an orc with a rusty handaxe.
-Hyp.
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