You might have noticed that the downloaded files lauch another.
That application is Expander. An other way to launch Expander, is
to simply double-click on a supported archived file type.

Expander handles most compressed files under Zeta. Because applications
tend to be very large files, they come in a compressed form that
takes up less space and makes downloading them faster and easier.
Compression can be done in many ways. Zeta's Expander handles the
following standard archive types: .zip, .tar (Tape ARchive) and
.gz (Gzip). Zip is the most commonly used compression technology.
The compression scheme most commonly used with tar is gzip, which
is why you often find files with names like filename.tar.gz.
To install applications that come as archive files, you must return
them to their original state. Recovering a full-sized file from
its archive file is nown as extraction. That's where Expander
comes in.

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