[exim] Saving out an attachment

I need to process files of a certain type (*.aaf), we were looking to do
this as part of a pipe in a forward, but I'm wondering how to do this
withing exim? I've been reading a bit on content scanning at ACL time, and
I think you should be able to do it, I'm just unsure where to go with this
and would appreciate some direction. Thanks


Derrick MacPherson
dmacpher@???