Another good idea is to search for DVDs you have and make a modern MKV rip of them if only AVIs exist. You would be contributing a better quality version made for modern computers.
Not just computers… Some mobile devices as well, such as my new Motorola Moto Z Play smartphone, which can handle pretty well any format, up to and including full 1080p HD. It's apparently a VERY new and also pretty badass little handheld device that even out-powers my relatively recent Asus laptop, as sad as that is to say.
Yeap! Technology has come a long way.