enchanted missile weapons

[Joel Gunderson <belgarat@expert.cc.purdue.edu>]

I was under the impression that enchanted missile weapons (bows and
slings, not thrown stuff) only give a bonus to hit.  Some people have told
me this past weekend with some rather opinionated reasoning that the
damage bonus is also added to the arrows.  I tend to disagree with this,
due to the fact that the way they explained it was that the weapon
instilled the missile itself with it's magic.  This gets gross, especially
if the bow is effect because then there'd be a shload of +whatever arrows
lying around.  The way the spell is written, it directly enchants the
weapon you cast the spell upon, and would not affect the arrows any way
you twist it.  I need some facts or opinions here.

Joel