I'm hacking on FlixMix, a 1993 DOS game. I kinda assumed it'd use FLIC files, but nope, it has its own animation format. A really bad one, it's not compressed at all.
The animations are also split into three files, FLIXMIX.001-FLIXMIX.003, which are each about 1.1mb, meaning they didn't have to have an elaborate installer, which could support having one big file spread across three disks