...is simply my signature (which appears on all my posts) and not part of my reply.
Anyway, once you've opened your folder (as mention by rafi) containing the downloaded files, open vlc then drag'n'drop the file onto vlc interface.
(Forget MediaInfo for the now, but when installed it adds a right-click context menu entry to media files & when you right-click on such a media file and select MediaInfo. a small window opens showing details regarding the files properties such as codecs used. As you have vlc, this program already comes with the necessary codecs required to play most files).