I think lynx automatically gunzips (much like Netscape does), as the .gzipped version should only be around 80 MB.
Try typing:
more content.rdf.gz
and if it is in clear text, then it's already unzipped and you should type:
mv content.rdf.gz content.rdf
Then you can edit Parse_RDF.pl and set what section you want, and start it going. It can take anywhere from 5-20 minutes depending on your server to parse out the data you want.
It will append the information and not erase your existing links (i.e. if you run it twice, you'll get a lot of duplicates).
Cheers,
Alex