User-agent: Yandex
Disallow: /*.doc$

User-agent: Slurp
Disallow: /*.htm$
Disallow: /*.html$ 

User-agent: msnbot
Disallow: /*.htm$
Disallow: /*.html$

User-agent: Webalta
Disallow: /*.htm$
Disallow: /*.html$

User-agent: Yahoo!Slurp
Disallow: /*.htm$
Disallow: /*.html$
Disallow: /*.shtml$
Disallow: /*.shtm$

User-agent: Yahoo! Slurp
Disallow: /*.htm$
Disallow: /*.html$

User-agent: Yahoo!
Disallow: /*.htm$
Disallow: /*.html$
Disallow: /*.shtml$
Disallow: /*.shtm$