Support for Files in Packaged Files
(copied from developer forum post)
Being able to tie the curiously named "Tableau SDK" aka Extract API into this project would help us complete the circle of offering data => TWBX capabilities for customers. To that end, we'd need to able to manipulate the packaged files through the API, even though this just means managing files in a ZIP. This is actually slightly more complicated, though, as we need to make sure the references in the TWB/TDS stay correct even as the files are replaced.
The files in packaged workbooks include: Images, Data, Shadow Extracts (though I have no idea what we'd do with those), ummm...and I guess you could lump Shapes into that list (though those are base64-encoded and included in the TWB itself). If those were addressable through the API, it'd be a real timesaver.