Text body attached as rtf (ms-tnef?)

Hi all,

I have a gaggle of .msg files I'm attempting to process into HTML 
documents with the corresponding attachments linked.
Thus far I am converting the .msg format to .mime with msgconvert 
(http://www.matijs.net/software/msgconv/) and processing each message as 
a single message with MHonArc.
This works fine except MHonArc is bundling the text bodies of the emails 
into an attached .rtf. My guess is that the email's text is actually the 
ms-tnef format which MHonArc is handling as best it can. However I 
really need the body text available as the body text in the outputting 
HTML document, not as an attached .rtf.
Does any one have a solution to this? Is there a way to have MHonArc 
process the text body as plain text? Some formatting loss is alright 
provided the text is still readable.
Thanks,
Walker