Typographic quotes broken after editing in Sigil
I have several epub files created with standard western font encoding, that I have opened in Sigil to embed cover graphics. After saving them, I find that typographic quotes have been converted to ... I'm not sure what. Unicode?
For instance, a typographic apostrophe now appears as ’, an open double-quote as “ and a close double-quote as �?.
Does this make sense to anyone? How do I fix it?
(I've seen it before in other contexts, and expect it has something to do with a specified encoding, but I don't know what's wrong and how to fix it.)
Thanks for any help.
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