[Zope] SMIL and mime types

[tom smith]

I'm trying to use zope to create SMIL files...

So I have a DTML Method with called smil.smi...

----------------------------smil.smi-------------------------------
<smil xmlns:qt="http://www.apple.com/quicktime/resources/smilextensions"
qt:chapter-mode="clip">

STUFF SNIPPED OUT

<dtml-call "RESPONSE.setHeader('Content-Type', 'application/smil'   )  ">
----------------------------------------------------------------------------


If I request this document, it doesn't launch QuickTime Player or RealAudio
(I have set up my browser). If I create a file with a reference to this file
in an embed tag. I get...

SystemError
Sorry, a Zope error occurred.


any ideas?

tom