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Changing the extension of the file to .mov from .undefined seemed to work on one video from the list I tested. Try that

Another thing you can try is...

Right click on one of them and click on "Open With....." and if you have a separate media player such as VLC, then click on that or any other media player. They'll open then.

Thanks for the share! Max reps added.
Does anyone happen to have Ninja Training Secrets,
one of his other products that he mentions?
Thanks,
PQ

Thanks for this great share! +reps