the demo file consists of Enemy Territory game data so its not possible to view the demo without the game itself, or ofcourse if you somehow are able to remake the hole game source needed to make some "demo viewer program" :D
Send the demo to your friend, who then opens it with ET, records a video from it and sends the video to you. If you don't have any friends, then you'll have to watch it with ET at least once.
so no
I just type the time (that i want to record) and the program saves the action into avi..
:XD
(dont take me serious, just flaming around randomly)
you need et anyway, but there are programs like seismovision which are kinda handy.