David, thanks so much for the quick reply. It could be that I'm misinformed about exactly what Filehistory does in Windows 10. Perhaps someone else can confirm its interaction with Calibre. In the meantime, I'll do some more research. As regards my 'newish' comment . . . I recall my reluctant switch from DOS over to the 'new' Windows sometime around 1985, so I guess I'm dating myself!
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