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User-agent: Googlebot-Image
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User-agent: msnbot
Disallow: /*.jpg$
Disallow: /*.jpeg$ 
Disallow: /*.gif$
Disallow: /*.zip$
Disallow: /*.png$

User-agent: msnbot-media
Disallow: /

User-agent: psbot
Disallow: /

User-agent: *
disallow: /*.zip/