D2X is a modification of the Descent 2 source that was released by Parallax.
It's mostly compatible with the original Descent 2, both in multiplayer and
on the local machine.
This package comes with the shareware version of the game. If you want to
play the full (registered/commercial) version of the game, place the
alien1.pig, alien2.pig, fire.pig, groupa.pig, ice.pig, water.pig, descent2.hog,
descent2.ham, descent2.s11 and descent2.s22 data-files from your registered
descent version in /usr/share/d2x/full; or in $HOME/.d2x-rebirth.
If you want to have the movies also add the intro-h.mvl, other-h.mvl and
robots-h.mvl files to the dir.