you have to use a third party to do it, and I don't know any free ones.
- one suggestion, download a copy of 'Open Office' (free

)
http://download.openoffice.org/2.0.1/index.html
and use the 'save as pdf' facility with your file, then attach the pdf to an email. (works as a genuine 'save as', not a printer driver, like some pdf generators)
(warning it is a big download 78MB)