a very short answer to a very short question
you play it in a video player
Please be specific in the question
and as to the first post . Files ending in *.exe are MS Windows programs and require a Microsoft operation system to use .Like Windows 7 , Vista or XP .
is this what you have ???
"HP DreamScreen 100 - Digital AV player"
http://www.google.com/search?q=dreamscreen