Allen:

It's a standard .mpg. The camera is a Sony Vixia HF10 from 2008.

Virtually everything contemporary on the web is in html5. It's not a video format, it's a coding format for websites (including how videos will display within a page, though not the video encoding itself). I just looked, and this site is still xhtml 1.0 transitional, which is older than God... Even the Parks' Fly Shop site I did in 2011 was in xhtml 1.05. Html5 has been the standard for 4-5 years now.

I would actually suggest downloading a video codec pack, such as this one: https://www.codecguide.com/download_kl.htm