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These are the contents of the .twbx file that is being pulled down. - Packaged Workbooks - Tableau describes the contents of a .twbx file. Your post would indicate that the file is being unzipped (.twbx files are .zip files) or is the picture a view of windows compressed folder view.
We realized that some user set-up his Tableau Desktop repository on this remote network location. That's why these folders keep being recreated even though we delete them.