Page 32: Artificer—Item Creation
Magic items created by an artificer are considered neither arcane nor divine.
A wizard can't copy a divine version of Magic Missile into his spellbook because it's not an arcane spell and as such cannot be cast with arcane spellcasting, if for example an Archivist were to scribe a scroll of Magic Missile.
Magic Missile as a Divine Spell is available from the Force Domain
In that same vein a Wizard can't copy an Artificer's scroll because it's also not arcane.
EDIT: Page 178 of the players handbook, talks about adding scrolls to a wizards spellbook, and you'll note it mentions the spellcraft check to decipher "Arcane Magical Writings" this implies the scrolls the wizard adds to his spellbook are Arcane Magic, a Divine scrolls would not have Arcane Magical Writings, they would have Divine Magical Writings. This is an assumption but the prayerbook rules basically state: Use the Wizard's spellbook rules except Divine.
Because an Artificer's items are neither Arcane or Divine they would lack either Arcane Magical Writings and Divine Magical Writings, meaning these writings cannot be copied over... they are Artificer's Magical (Or Infusion?) Writings
Even if you allowed the Wizard or Archivist to copy an artificer scroll into their book they could not prepare and cast the spell because it would not go into an arcane or divine spell slot and they lack infusion slots.