Wish I had a script for Windows...it's a painstaking operation doing a search & replace for the quotes in the Lucia Omnibus
You'd think only a few chapters would suffer from this weird phenomenon that Calibre can't deal with, but it's ALL of them. 12 chapters are complete -- only 81 (!!!) to go.
The only relief is that I only have to manually fix the front-end quotes, Calibre correctly transforms the end-sentence smart quotes.