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Once you package a workbook, Tableau zips up the data extract (tde) with the twb files and embeds the files within one twbx file. Once you open the twbx, I beleive Tableau unzips the file and creates a temporary copy of the tde as per your screenshot.
If you want a data extract refresh to apply to multiple twb files, then you need to work with the original twb's - connecting to a tde file, not using twbx's.
I myself have had some nasty problems sharing a common tde file amongst multiple TWB's - including corruption of dimensions, measures and calcs, and would recommend against it. I would recommend a tde for each twb, and to refresh them one at a time.
Of course, if you are running tableau server, you can automate the data extract refresh using a schedule task.
Hope this helps.
Craig, thank you for your reply. I just saved the master Tableau as twb's and I can see my extract in dropbox now. Your explanation is a great help. Thank you
Thank you for the solution of this problem. When I tried the steps provided by Tableau community http://kb.tableau.com/articles/howto/changing-the-file-path-for-extracts, I lost all the data source filters. Is there any way we can retain those data source filters.