Restrict indexing and link crawling within your website

You can block MSNBot from crawling specific file types linked to your website by specifying MSNBot as the user-agent for a Disallow tag that specifies the file types to exclude.
To do this: Use this syntax: Examples
Restrict MSNBot from indexing specific file types

User-agent: msnbot
Disallow: /*.[file extension]$


(the "$" is required)

User-agent: msnbot
Disallow: /*.PDF$
Disallow: /*.jpeg$

Disallow: /*.exe$