There’s a long list of formats dropped in last fall’s macOS update, and it includes faves from years past: RealVideo, DivX, Sorenson 3, FlashPix, and many great hits that eventually were superseded by improved encoders. But less remarked upon were video formats that relied on software components Apple had never updated to 64-bit compatibility. That meant iPhoto and a host of third-party apps could no longer be used after upgrading. With macOS 10.15 Catalina, Apple gave up on 32-bit software after two years of Apple warning about that event coming. Apple sheds the past as necessary to provide new features in its products.