Can't locate Engage *.intr files that have been updated via Storyline 2

The link below says that a copy of the Engage source is kept in the Storyline Project File. How do I locate the file and the *.intr files.

https://www.articulate.com/support/storyline-2/articulate-engage-interaction-copied-from-one-slide-to-another-uses-same-source-file-sl2

 

Regards

Steve

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