Ranking order based on file extension

"Shivakumar GN" <[email protected]>
Newsgroups gmane.comp.web.swish-e
Message-ID <[email protected]> 
Hello,

I am using swish to search a large repository of files that are in
html,pdf & doc format and serve the search results to the web clients.
I have a requirement to reduce the ranking of a file if it has pdf or
doc extension.
>From swish documentation or the discussion archives, I couldn't find
any details along these lines.
Can the rank order be customized based on file extension, if so how
can this be done.

TIA

best regards
Shivakumar
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