Yes or No?

Whilst I’m on the topic of odd and fairly unhelpful dialog boxes, here’s one I got on my Vista box trying to copy a few files over the network:

yesorno

Apparently, the right answer to copy is ‘Yes’, but honestly, where’s the logic on this one? I can only think they’re asking whether they see copy and move as a single activity, but since there’s no follow-up to this question, I can’t elaborate on it.