There is only one file type that uses the .TDE extension:
Tableau Data Extract File

- Developer Tableau Software
-
Popularity
- Category Data Files
- Format Binary
A TDE file is a data file used by Tableau Desktop, a whiteboard visualization and analysis application. It contains data extracted from an external data source, such as a Microsoft Excel workbook, Microsoft Access database, or a .CSV file. The data may also be extracted from a remotely connected data source.
TDE files are used for storing external data in a format recognized by Tableau software. They are useful for keeping local copies of data so that the data does not have to be reimported from the external source again.
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Updated: August 28, 2017