The file "crl209.tar.gz" can be unpacked using the standard utilities on a UNIX system. Download the file to your system, it is available from the web site. (Remember to set the "binary" transfer option if using FTP, kermit or some other similar file transfer protocol.) The file has been compressed using the UNIX GNU gzip utility and can be uncompressed using the command "gzip -dc". The utility, "gzip" is readily available for all platforms, and produces a better degree of compression than the standard "compress" utility.