Reducing QTw/alpha channel file size

I was just handed a 01:30min QuickTime file (with and Alpha Channel) that is 960 MB. The client wants the file size to be significantly (10mb/min) smaller, for internet/flash use. I figured out how to export it (thanks to the forums) without loosing the alpha channel, but even setting it to it lowest quality doesn't seem to be reducing it's size. Perhaps this request is impossible; I am unexperienced with using the Animation/Millions Colors + in QuickTime so maybe that size is normal because of the alpha channel?! I have no idea. So any assistance would be greatly appreciated. Let me know what my options are. Thank you so much.
Brittney
G5 Mac OS X (10.3.9) 1.6 Power PC 1.25 Memory

Yes the client will be importing/exporting into Flash. He's just looking to make the 900MB file smaller before importing it into Flash. I am not familiar with Flash and it's capabilites, but I'm assuming it can do the final compression for the web.
I did try the PNG and TGA codecs instead and they didn't seem to make the file signifiantly smaller (10MB differences), so it looks like I've hit a wall. Perhaps it's something beyond FCP's capablities.
Thank you for the suggestions
G5 Mac OS X (10.3.9) 1.6 Power PC 1.25 Memory

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