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Unfortunately I can't offer direct support, and I might suggest posting on another forum. I am always will to help if I can and I found this which you might found helpful:
This reply was removed on 2014-11-21.
see the change log
see the change log
From another post, I find the following content that explain the reason and provide the solution to play any AVI files on Mac QuickTime:
Why QuickTime Won't Play AVI Files?
AVI (Audio Video Interleaved) is a container format designed by Microsoft to wrap audio and video stream together. The video in AVI file can be compressed by many kinds of codec, such as MJPEG (Motion JPEG), MPEG-1, MPEG-2, DivX, XviD, WMV and others. To play all AVI files, your player must support all of these codecs. So far, no matter you are a Windows user or a Mac user, QuickTime only natively plays AVI files with MJPEG video.
How to Play AVI files on QuickTime?
As a great open-source QuickTime component, Perian ( The swiss-army knife of QuickTime® components ) is the saver to allow QuickTime to play all kinds of AVI videos for Mac users.
Unfortunately, the latest version 1.2.3 of Perian is not compatible with Mac OS X Mavericks (10.9), Mountain Lion (10.8) and Lion (10.7).
In order to solve "QuickTime won't play AVI" on Mac (Mavericks included) and Windows, it is best to convert AVI to QuickTime more popular formats like MP4, MOV.
As a container format, AVI is not a specific type of file and there is no single codec for videos with .avi externsions. This is the reason why you can't play AVI movies with Quicktime on Mac or Windows computers. Luckily, here are three simple solutions that will allow you to play AVI on your computer.
Solution 1: Convert AVI to QuickTime MOV for free playback
To finish the task, I recommend you this Video Converter for Mac, which enables you to convert an AVI to any popular video format for various players, devices and applications. For QuickTime, you can convert the AVI to an MOV file that is associated with QuickTime.
Solution 2: Get QuickTime Component: Perian
Solution 3: Switch to Other Media Player for AVI Playback
There are many third-party video player for Mac, VLC, MPlayer , etc.