AVI was a standard option on ye olde Final Cut Pro 7. I believe that was a function of QT Pro, which is still available as a download from Apple, $30.
This might help, suggests using MPEG Streamclip.
I keep a virtual copy of windows running in "Parallels Desktop for Mac" with a second install "Media Encoder" and "Quicktime for Windows" installed for making WMVs and AVIs. I believe the creative cloud license is ok with this as they have have active checks to keep you in compliance with the license and it allows me to activate 2 installs. I prefers to use the native windows encoders over a 3rd party implementation.
Alternatively, you could also install the open source ffmpeg to output AVI. But you will need to run it with the command line or pay for a plugin like this to give it a GUI in AE.
I believe that this syntax will work to change uncompressed quicktime to an AVI container using the command line.
ffmpeg -i mysource.mov -vcodec copy -y myoutput.avi
Here is more info on installing FFMPEG for those who want to try it.
How to install FFmpeg on Mac OS X | reneVolution