#3 Demo forgets document format

[James W. Walker]

If you save a file as RTF, modify it, and then save, it is saved as
text, not RTF. To fix this, go to the function CompleteSaveAs in
WeDemoNavDialogs.c, and between the SaveDocument and
NavCompleteSave calls, insert:

ioCD -> document->fileFormat = ioCD -> fileFormat;