Introduction
According to Microsoft, DTSX is an XML-based file format that stores the instructions for the processing of a data flow from its points of origin to its points of destination, including transformations and optional processing steps between the origin and destination points. In a nutshell, when you are creating your SSIS package, the SQL Server Data Tools SSIS Designer creates and saves all the data about your package into an XML file. As you may know, XML files in general are not designed for human consumption, as anyone that opened and tried to read an XML file can attest