If I repetitively export two or more diagrams, the file export locations (which
are different) are remembered for each diagram.

If I close a diagram in the editor, then reopen that diagram later, the export
location is not remembered. It is set to a non-user-definable location in my
Documents and Settings.

With OpenOffice, when a file is exported, the last export location for that file
in that session would be used. If the file had not been exported in that
session, then a user-defined default location would be used.

I would like to see this option available in Studio. 

A second option (even better) would be to persist the export location for a
diagram, even after the session is closed.