Attachments with no Content-Type mime header

[Pedro David Marco]

Hi everybody...
When an email has a MIME part with no Content-Type header, is there any way to 
force SA "guess" the format based on other criteria... file extension, for 
example?
Example:
Content-Disposition: attachment; 
filename="details.pdf"Content-Transfer-Encoding: base64

Thanks!
----PedroD