Files ending in .hqx are binary files which have been converted to
BinHex format so that they can be transmitted as ASCII text files via
the Internet.  There are various utilities that will BinHex and de-BinHex
files, among them Compact Pro and StuffIt (see below).  Some Mac ftp
clients such as Fetch will automatically de-BinHex files when you download
them.

Files ending in .cpt have been compressed by Compact Pro; files ending
in .sit have been compressed by StuffIt.  Compact Pro by Bill Goodman
and StuffIt Lite from Aladdin Systems are shareware; they can be ftp'd
>from  any of the major Mac ftp sites, and the registration fee for each
is $25.  Files ending in .sea are self-extracting archives; just double-
click on them to extract their contents.

StuffIt Expander is a nifty free utility from Aladdin Systems that will
uncompress StuffIt, Compact Pro, and Applelink archives.  It will also
decode BinHex 4.0 files without requiring you to first strip the
headers.  It's available at info-mac in MacBinary and binhex formats as
<ftp://mirrors.aol.com/pub/info-mac/cmp/> and
<ftp://mirrors.aol.com/pub/info-mac/cmp/>.