When a new or updated Help book is installed, the Help book service helpd is supposed to recognise it, add it to the list of Help books which it maintains, and compile its data into a private database and supporting files stored in ~/Library/Caches/. Traditional Help books consist of HTML files assembled into a special bundle, with the extension. Many apps now choose to use their own Help systems some time ago, I started to move all mine to PDF documents, which my own apps manage and display without relying on the Help system built into macOS. I suspect that this may not be its fault, but the result of a revamp of UTIs, which are used to identify file types. With macOS 11 Big Sur and later it has relapsed, and in some cases can’t open an app’s Help book at all. The last time it had a thorough overhaul was back in High Sierra 10.13.4, when it was taken off life support and left hospital walking unaided.
The Help system in macOS is another of those areas which has become sadly neglected.
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