Olle, I may be a bit stupid, but why is filename = :b:iso-8859-1: R/Z0dGluZ2VuLm1hcA== so much simpler than filename = =?iso-8859-1?b?R/Z0dGluZ2VuLm1hcA==?= that it is worth creating a new, incompatible coding scheme for it? Harald A