Attachs with a non ascii name

Hi everybody!!

I need to save the attachments in the server with their own name using
the parameters : usename and subdir for the filter. Example:

image/jpeg; m2h_external::filter usename subdir; mhexternal.pl

But i have problems because some file names are encoded with iso-8859-1:

For example the name in the email for a attachment is:
hola =?iso-8859-1?Q?qu=E8=20=F1o=F1ooooo=20t=E1l?= (jo ve).doc

Can i tell mhonarc that the name is in iso-8859-1 charset???

Thanks