.txt files as attachments and not inline ?

Hello all,

Sorry if this question has yet been submited, but not found in the archive.

I would like to put as attachment all text files sent as attachments. 

1. Tried to modify the text/* property in the <MIMEFilters> to let MH use the 
m2h_external::filter; but in this case, all the message and his attachment are 
converted as attach.

2. Trid to erase the text/* line and put a text/txt line using 
m2h_external::filter; . Doesn't work : text is inline.

So any idea ??

In advance, thank you

Juan del Rey