Would you like to know how to do this for movies that you watch on your Mac or movies that you watch online using Firefox? If it's for Firefox this might be useful- http://kb.mozillazine.org/Video_or_audio_doesn't_play
You might have to copy & paste the preceding link.
I'm not using Leopard yet. However, on my current system, I went ahead and installed a System Preference that allows me to control all MIME settings. Check out the free RCDefaultApp. Once installed, you will have access to it in your System Preference window. Hopefully it'll be compatible with Leopard.
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