Hypersmurf said:
Yup.
Also remember - a bow isn't a weapon, it's a Held Object, for such purposes.
-Hyp.
Interestingly enough, you don't need a magical weapon to sunder a held object, even if said held object is magical. So you can sunder the +5 Shocking Screaming Holy bow with a rusty dagger if you wanted.
It actually makes sense for bows, if you think about it. A magical sword is enchanted to be flexible, yet strong, to have an unnaturally sharp edge that never chips, and to cut through things harder than mundane steel (that's how it bypasses DR, I'm thinking).
A magical bow is enchanted, not with charms of hardness and duribility, but to guide an arrow with magical accuracy, to bend more easily than the poundage of the bow would seem to indicate, to be, in essence, even more of a precision instrument than it was.
The enchanted sword has a reason to be enchanted to be strong - that's what a sword needs to be. Stronger swords are better and its enchantments just make it that much stronger.
The magic bow is not intended to slice through metallic dragonscales by itself. A super-strong bow is worthless, since you can't bend it. Its magic does not enhance its toughness - just its abilities to make an arrow fly true.
I have a feeling most groups don't play the rules like this, but it is a literal interpretation of the "bows are a held object not a held weapon for purposes of sundering" rule.