RE: SMIL 2003 proceedings available

Hi all,
 
Does anyone know the answer to this.  If I reference a quick time movie
within a SMIL presentation e.g
 
<ref dur="indefinite" src="s2i_02_jwocky1.mov" alt="jab" left="102"
top="102" width="304" height="289" region="main" fit="fill"/>
 
if I play it in Real Player, it tells me that some additional software is
necessary - which it then downloads, and yet still refuses to play when it
gets it - saying that I need to reinstall QuickTime.  However, should you
attempt to open that .mov QuickTime file **directly**  - through the
File/Open in Real Player - it happily plays it.  Is this a  bug in Real
Player, or do I need to add additional namespace definitions?    What I
currently have is:
 
<?xml version="1.0" encoding="UTF-8"?>
<smil xmlns="http://www.w3.org/2001/SMIL20/Language">
 
Steve Bennett