TDSX file refers to a Packaged Data Source file. It is basically a .zip file that contains the data source file(.tds) and any other local file data like extract files(.hyper or .tde), Excel workbooks, text files, local cube files, and access files. This kind of file is used to create a single file that can be then shared with others not having access to the original data source.

BY Best Interview Question ON 07 Mar 2020