Most (if not all) of the How To videos located on this site were
built on Googles WEBM html5 Video format.
If you are using Google Chrome you should have no problem with them
playing in your web browser. Firefox seems to be able to play these
videos as well with no issue. Microsofts IE web browser will not
play these videos unless you have the proper codec installed. Here is a
link to googles codec install package. https://tools.google.com/dlpage/webmmf