Can't open an .avi in Quicktime

Hello,
I'm on an iMac 17" 10.4.11 2 GHz Intel Core 2 Duo 1 GB 667 MHz DDR2 SDRAM and when I try to open an .avi with Quicktime I get the message that additional software is required for Quicktime to play this media. It may be available from the the QuickTime Components page. When I go to that page there are a bunch of options and I'm not sure what I need.
I downloaded Perian and Flip4Mac thinking that would solve the problem but it doesn't. The .avi will open in VLC no problem but just wondering why it won't open in Quicktime. What additional software do I need?

Launch the QuickTime Player, open it, and choose to display the inspector or properties from the Window menu, or use MPEG Streamclip to check the format.
(55887)

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