HTML+TIME support in IE7 ?

Hi all - i'm trying some audio and video stuff in IE7, but it doesn't 
seem to work
(HTML itself and pictures work ok). Yes, i have "play sound in pages" 
turned on.

http://msdn2.microsoft.com/en-us/library/ms976099.aspx
says that HTML+TIME includes a default player so you don't have to 
specify a player in most cases.
But this default players seem to be gone from IE7 (and btw, what are 
those "most cases" - when would
it not work?)

I seem to remember that at least MS' own examples worked in previous IE 
versions (5.5 and 6);
now, in IE7, example 6 on
http://msdn2.microsoft.com/en-us/library/ms976099.aspx
does not work (i see all 4 pictures right away, and clicking the buttons 
has no effect).
Example 7 should play a video, but it doesn'.. what is going on?

Puzzled,
Damjan B.