.artpkg Files

Good morning, 

I downloaded 2 files from the below community locations. The files download as .Artpkg file type. The files will not open with Articulate Engage 360.  I added the .zip part at the end to be able to see the file folders.  I then click the template in which get the attached pop ups when trying to open with Articulate Engage 360  

https://community.articulate.com/download/carousel-interaction

https://community.articulate.com/download/flashcards-interaction

Would it be possible to let me know , what program is needed to open the files ?

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