User-agent: *
Disallow: /*.pdf$
Disallow: /*.doc$
Disallow: /*.docx$
Disallow: /*.ppt$
Disallow: /*.pptx$
Disallow: /*.pps$
Disallow: /*.xls$
Disallow: /*.xlsx$
Disallow: /*.rtf$

User-agent: bingbot
Crawl-delay: 20