[zzo38computer]

I would want to use separate programs for displaying videos, whether or not the operating system includes them. Being able to play, pause, seek, set caption styles (including size, colour, and opacity), record it on a DVD, etc, would be helpful, but that can be whatever program you decide to use that has the features you wanted; whoever made the video or wants to send it to you should not need to care which of these features you are using (although they will need to include captions if you want them).