mailcap and Microsoft OOXML

[steve%prd.co.uk@localhost (Steve Blinkhorn)]

Can a mailcap entry make an attachment with these headers:

Content-Type: application/octet-stream
Content-Transfer-Encoding: base64
Content-Description: Microsoft OOXML
Content-Disposition: attachment; filename="acctkey.xlsx"

be read with scalc?   More generally, is there a way of parsing the
Content-Description header along with the Content-Type to cope with
application/octet-stream attachyments?  I get a lot of spreadsheet
attachments, some of which start up scalc and some don't and have to
be manually saved and opened outside the mail reader.

Or is this something specific to individual mail readers (being of
Jurassic vintage I use elm).

-- 
Steve Blinkhorn <steve%prd.co.uk@localhost>