Quote:
Are there any other characters to watch for?
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I would guess that any character that had a numeric value in W-1252 different from its UTF-8 value. Curly quotes, maybe?
According to the epub spec, you should only be using UTF-8 for your text input. If I ran the Sigil world, Sigil wouldn't even try to edit your file if it declared a different encoding.
So yes, you need something that will translate from W-1252 to UTF-8.