This file contains data source definitions for use by the Teradata .NET and Oracle .NET data providers. These definitions include connection information and (optionally) a list of Databases to be loaded into the Database Explorer Tree and the color bar to be displayed in the Query window for this data source
This file is rewritten each time the application is shut down.
There might also be a DataSources.config file in the ProgramData path. That file contains system level data sources. The application never updates it.