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You need to get data files from an original Descent 2 CD.
The CD contains a file named descent2.sow which must be
extracted with unarj to:

  %%DATADIR%%/data

After extraction the following files may be deleted:

  d2-2plyr.hog
  d2-2plyr.mn2
  d2.bat
  d2chaos.hog
  d2chaos.mn2
  d2icons.dll
  descent2.dem
  descentg.ini
  endnote.txt
  modem.lst
  pcxview.exe
  readme.txt

If you want the original movies to play back, copy *.mvl
from the CD to:

  %%DATADIR%%/movies

See http://www.descent2.de/ for more information and addons.
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