You can upgrade this database to Oracle 9i if you have that, simply install 9i, run up the database using that
ORACLE_HOME and run the upgrade scripts in
?/rdbms/admin. The format of the DBFs is compatible enough to make this work. If you can get onto 9i, then you're OK as there is a clear upgrade path from there to 10g and 11g.
Unfortunately if you don't have 9i (specifically 18.104.22.168) then it's not straightforward - it's too big a jump to 10g by just running it up in a new
ORACLE_HOME, you need a working 8i so you can
imp if you want to do it in one step. You will need to open a TAR and get Oracle's help (if only to get the media).