OK - results:
With a very long file name book, if I d/l it from Amazon using a K4.1.3, then it appears in the K as an azw3. But it also has a short filename. Gobbelino London a Menace of Mer-asin_B0C3YZN5SP-type_EBOK-v_0.azw3
If I do the same with a Gen 12 KPW it has a very long file name - Gobbelino London & a Menace of Mermaids: Cats, snark, & dangerous waters - a complete funny, cozy urban fantasy series (Gobbelino London, PI Book 6)
If I set up Calibre with 'default' TMP dirs, I can happily import the K4.1.3 azw3 with the appropriate plugins.
Interestingly, once in Calibre, the books appears with the very long file name but still converts to Epub.
So in this case (and I've tried this with several very long file name books) using K4.1.3 bypasses the TMP dir issue.
So for the time being this allows me to backup my purchases.
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