running MHonArc from scratch: attachments

Hi,

I occasionally rerun MHonArc from scratch (on a full directory of mail
messages). It rewrites all the "msgNNNNN.html" files, as you might expect,
but saves old "zipNNNNN.zip" files (and other MIME attachment files),
leading to an eventually-gigantic directory. How easy would it be to have
MHonArc rewrite attachment file names as well as "msgNNNNN.html" filenames,
when run in this manner? Any hints where I should look?

Eddie