There is only one file type that uses the .TSI extension:
Traktor Settings File
Settings file used by Traktor, a DJ program used for making music mixes; may store audio, effects, keyboard, and layout settings; also can save settings that map a DJ controller device to the software; allows settings to be remembered and the DJ controller and Traktor software to be in sync when creating mixes.
To import a TSI file, navigate to the Traktor Pro preferences, select Controller Manager, and click Import.
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Updated: February 24, 2013