use tar -ztvf XX.tar.gz to see what's inside
tar -zxvf to extract it
alternatively use can use mc in a console.
If it contains something that look like a standard unix tree ie /usr/local/bin etc
you can try to :
extract it in / if you have space
extract it in /mnt/card to put it and use ln -s to link the files in /mnt/card/usr/ etc to /usr/local/ etc.
for instance ln -s /mnt/card/usr/local/bin/gtp /usr/local/bin.