If the remote file (see section Including an ftp reference) is a compressed tar file, you can use
C-c C-m C-t (mh-mhn-compose-external-compressed-tar).
Then, in addition to retrieving the file via anonymous ftp, the
file will also be uncompressed and untarred. You are prompted for the
remote host and pathname and the content description. The pathname
should contain at least one `/' (slash), because the pathname is
broken up into directory and name components.
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