Quote:
Originally Posted by jhowell
When KFX format was introduced Amazon reconverted books that had originally been published using a DOCX or EPUB source. That included books published using Master MOBI files created by kindlegen since those include the original source files within the Master MOBI file.
Books that were published using a MOBI file created some other way without the original source were left as is.
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Yes, that's all my understanding too. The publish dates also suggest it, as it was quite a while ago they stopped reflowable mobi (kf7) uploads on KDP (I forget when).
The onus is really on the the people that originally uploaded only mobi/Kf7 reflowable ebooks to upload fresh epub, or at worst docx.
Large publishers have a different workflow and don't use the public KDP that anyone can use.
And of course if you use Download rather than Whispernet, you have to pick which registered kindle the file is for. Dual purpose, the suitable DRM keyed to serial number and "correct" format. Whispernet gives KFX, AZW3 or azw/mobi depending on what is.
Other people (not Amazon) offering Kindle files either offer dual-mobi (embedded KF7 & KF8), or old mobi KF7, or azw3/KF8, or epub for "Send to Kindle". They don't know what your Kindle is. These can be PD or copyright bought files, but in either case no DRM.
Edit:
I last bought a computer with Win7 1st Nov 2016 (finally wiped Win7 on it Jan 2017, now Linux Mint 21.2). MS retail sales ended earlier. Oct/Nov 2016 was the last date OEMs sold gear with it. Official support ended in 2020 and people didn't always accept every update. None mandatory. I think it still gets Defender updates and some others occasionally. MS also still activates XP re-installs by automated phone with digits entered on keypad. Some people have stuff that needs XP and a Mobo (needs re-authorised) or HDD can die.