This doesn't answer your question directly, but you can set an option with the OpenSSH client to skip that confirmation: 

$ ssh -o StrictHostKeyChecking=false remote_host

[download]

I don't see immediately see an option in putty to do anything similar.

In reply to Re: Replying to prompts in an automated script by oeuftete
in thread Replying to prompts in an automated script by mpettis

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