Rails - Jun 2006 - custom mime types for respond_to

Is there a way to add a mime type of my own to respond_to ?

There''s html, xml, js, ical etc ...

But I want to be able to respond_to Excel.

Excel has the following content-type header:
application/vnd.ms-excel

I want to use the new ?format=xml querystring parameters that respond_to 
can respond to.

So I want to pass in ?format=xsl or ?format=ms-excel so that I can 
return my results formatted for Excel.

Any ideas? Or do I need to potter around in the mime_type.rb source 
file?

Thanks
Joerg

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