files

[windos_no_thanks]

root@G1:~# tar -xf 3129-kfiresaver3d-0.6-leakfix.tar
root@G1:~# cd 3129-kfiresaver3d-0.6-leakfix.tar
bash: cd: 3129-kfiresaver3d-0.6-leakfix.tar: Not a directory
root@G1:~# ls
3129-kfiresaver3d-0.6-leakfix.tar jap.conf
Desktop kfiresaver3d-0.6
JAP xsession.knx-hdinstall.backup
Mail ymessenger_1.0.4_1_i386.deb
NVIDIA-Linux-x86-1.0-5336-pkg1.run

cd  kfiresaver3d-0.6

Any other deas or should I just give up.

What you should do is start reading man pages, in this case:

man tar

would have told you what running the tar command actually does
(Unlike M$ manuals and help files the man pages in linux actually contain some useful information )