I have noticied that when exporting (verified) or importing (deduced by looking at code) Microsoft project files, the duration associated with the ConstraintType (FF,FS,SS,SF) of the Predecessor is not taken care of currently. So I have patched the corresponding files in GanttProject, so that the same is handled properly.
Looking at the code and usage, I assume that GanttProject considers the Duration/Difference in Days, so that is what I have considered in my patch, which I have attached below.
HanishKVC
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svn diff patch to handle Duration/Diff wrt predecessor constraints in MPX format import/export