RewriteCond {HTTP_USER_AGENT} ^Mozilla 
RewriteCond %{HTTP_USER_AGENT}!(Slurp¦surfsafely) 
RewriteRule ^robots\.txt$ /someotherfile [L] 

User-Agent: *
Disallow: /cgi-bin/
Disallow: /images/
Disallow: /Connections/
Disallow: /Templates/
Disallow: /backup_graphics/