Text attachments converted to htm in email

[Mike Pokraka]

Hello wuggers,

I've used SOFM text attachments several times before, but this time round
the client is using htm as default mail format (4.7/620 system).

The problem is that all attachments are converted to HTML documents, EVEN
if I specify TXT. Double clicking and firing up notepad to read notes is
quick and simple. Firing up a browser is a pain. What's worse, RAW
documents are prefixed by a three digit line length in the resulting HTML
attachment, what appears in the browser is:

011 Text line 1
006 line 2
006 line 3

Any ideas on how to fix this and/or force attachments to TXT whilst
keeping email as HTML?
Cheers,
Mike

(Cross-posted to WUG and SDN)