by Johan G » Wed Nov 18, 2020 11:00 am
Well, while I can download it neither Win 10 or me can discern what file format it might be. It looks like it is not an image or a zip archive but rather some kind of Mac specific image or archive format.
It starts with "book"<null><null><null><null>"mark"<null><null><null><null>"8"<null><null><null>"8", but contain way too much data to be just a bookmark, in particular an about 900 kB long section with "AiCCPICC Profile" (likely a color profile or compression format) early on.
It might just be a livery with a missing file format extension.