Q: What the hell are these?
A: Event files for openCanvas 1.1, an art program.  They let people "watch" a drawing being done, like an instant replay.

Q: Where can I find openCanvas?
A: 1.1 is freeware, and can be hunted down with Google.  Later versions can be tried out and then bought:
http://www.portalgraphics.net/en/

Q: Got it.  How do I watch?
A: File -> Import Event File, then (hopefully) sit back and enjoy.