when the window shows you the content of the *.tar.gz
file, then this is Ark, the unpack program. Here you can unpack the files to a folder where you want to have the content. In the extracted files there must be an installer like install.sh
or something like this. And there should be a README
where you can read how to install the software just downloaded.
But as you are using FC3 you can search the software at www.rpmseek.com
and download an rpm. This can be installed by
rpm -ihv <name_of_package>.rpm
. The advantage of the rpm is that you can easily uninstall the software if you want...
Hope this helps.