If you have QuickTime Pro (not sure if you can do it in the non-Pro player), open your movie, and then go File > Save as > Save as reference movie. This creates a very small (usually 15k ~ 20k) file that iTunes will happily import, and through that, you can play anything that QuickTime can normally play but iTunes won't allow in its library.
There are a few major upsides to doing this, as well. You don't have to litter your music file with video files, only the reference files, so you can leave your videos where you want them. As well, while some videos can be brought into iTunes, not all allow for full editing (for example, some file types won't allow you to set the movie's thumbnail image). Reference files are fully editable under iTunes.
iTunes doesn't allow .avi movies to be placed in it, I know that already.
I also know about that little trick above in the quote, BUT...
am I also able to use automator to save a bunch of .avi movies as reference movies for me with Quicktime?
So I don't have to do it manually which would take a long time for me since I need to make about 80-100 references.
This action isn't in Automator right now, but I heard that you can also import new/custom actions. Till now I haven't found it so maybe someone can help me with it.
