Accessing AVI video with Alpha channel

I’m using the updated Boris Red with Avid Media Composer 2022. For years I used Boris Red 5 with Media Composer 6 and I was able to import AVI files with Alpha channel into Avid, but time moves on, and the current 2022 version of Media Composer doesn’t recognize my files, and so I can’t link or import them.
Boris Red won’t import them either, but I’m wondering if there’s something I can do to change that. I installed the K Lite codec package in case that made a difference, but no luck.