Cinepak’s long-lost brother?

While discmaster is stagnating (you know whom to thank for the shortages of HDDs as well as RAM), I still look through stuff there in hopes to find something interesting. Occasionally I manage to stumble upon something special indeed. This time it was navigable movies bundled with QuickTime 1.5 or so. Apparently the idea behind them is that all frames are actually tiles of a much larger picture that user can navigate without exhausting all RAM trying to decode it as one contiguous image. If you thought about ISO H.EIC (aka HEIF or AVIf depending on intraframe codec employed) you may be right, but also it got re-branded (and maybe enhanced a bit?) some time later as QT-VR (sometimes I think no matter how stupid modern multimedia idea is, it’s been implemented in QuickTime a couple decades ago). Anyway, out of four such movies, one was recognised and converted by discmaster software, two were playable (with my player) after I hacked file type tag to be MooV instead of APPL, the last one…