I am not certain, but you probably are seeing xarchiver because you are attempting to install a packagname.tar.gz file by simply double clicking on it or just typing it as an executable command at the command line. It sounds like your linux distribution is attempting to unzip and untar the file to reveal source code that you can compile, configure, and install.
As pointed out above, most linux distributions now use a package manager to make life easier. You don't need to resort to source code much anymore. Which distribution are you using?
If you have a .tar.gz file, you normally install like this:
tax -xvf packagename.tar
This will create a new directory named "packagename" wherever you issued the tar command. You then use cd to go into the new directory and enter either
su, and give the superuser password
to install it. Normally when the file is untar'ed into the new directory, there will be a README and INSTALLATION file in the new directory. You can read these with any standard word processor in linux.
Hope this helps, but again, tell us the distribution you are using. There is probably a much easier way to install the package you want.