Those are slackware packages. Slackware packages always end in .tgz form, which can be confusing. Oftentimes programs distributed in binary form use the .tgz format as well, but they lack the install script which 'installpkg' uses.
.tgz files are fundamentally the same as .tar.gz, but that format is normally reserved for source code distributions.
To install those files, use the command:
installpkg filename.tgz
Then have a look in /etc/lilo.conf
It's pretty well commented.
Make sure that rather than editing the existing entry, you copy a new one exactly as is, substituting the path to the new kernel in /boot for /boot/vmlinuz that exists.
This way, if the kernel doesn't mesh well with your system, you can at least boot back to the old kernel and figure out what went wrong.
This may help: I outlined exactly how I set up my Vaio S260 for wireless with ipw2200 on my site @
http://mshade.kicks-ass.net:8080/html/s260.html
--Shade