Me and N.Kindt at dune2k.com forums have made a high resolution patch. You can download it here:
http://d2kplus.com/hires.php
It has been reported that this fixes the split screen problem.
!!! Make sure you patch the game to version 1.06 first and use a 'fixed' .dat file like
this one:
http://d2kplus.com/subhousesfix.php !!!
Please feel free to post questions/comments on the forums at:
http://forum.dune2k.com/topic/19636-...gh-resolution/