Great place. Thanks for everyone's info and effort. I used the SE 1.1 which as above explained breaks the save files.
Then tried the newer DuneEdit2 The saves 37 are still being broken:
1/ The spice is NOT increased in the Sieges
2/ The architecture of the castle is being broken (that means that whenever you go to one of the "new rooms" aside the communication room the game freezes and have to restart and reload save.
Can anyone please help. I wonder why there is no TRAINER for this game (the CD version) yet. :-)