A file with the extension .DTS is a structured storage file created with Microsofts 'Data transformation services'(DTS).

DTS is a tool used for extracting, modifying and loading data and is associated with Microsofts SQL server.

.DTS files store hierarchical data within a single file.

.DTS files can be created to transport DTS packages from one SQL server to another.

SQL (structured query language) is a programming language used for querying, managing and modifying databases.