.TSD File

The tsd file extension is associated with the Tamino Schema Editor is used to create schemas that conform to both the Tamino schema language and the XML Schema standard.

A .tsd file stores various data used for internal purposes of the Tamino Schema Editor.

How to open:

If any program can work or access .tsd files, it would be Tamino Schema Editor.

How to convert:

It does not seem likely that .tsd files can be converted to anything else.