i modified my /etc/magic as follows to have a workaround for the problem until it gets fixed in debian. otherwise our custom software does not work anymore because it uses libmagic to determine filetypes :-)
# Magic local data for file(1) command. # Insert here your local magic data. Format is described in magic(5). 0 string \x89PNG\x0d PNG image -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]