Use this forum to discuss dungeon editors and other tools, like DMute (by George Gilbert, also working for RTC dungeons), DM Builder (by Sphenx), and ADGE by `rain. Includes DM editing tips and tricks.
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CSBuild will only save the file in it's original format (save or dungeon) and will also make it incompatible with anything other than CSBuild and CSBwin.
Until someone writes another tool, there's no way to do what you want.
Indeed, there is too much additional information needed in a dmsave.dat.
I'm sure CSBuild kept the file integrity in older versions...like, really old...because that was why questions like the expanded database question, etc used to be asked - to keep the saved game compatible with Atari and other editors. I guess wait to see what Paul says on the matter!