It's too late once the original document has been opened in Sigil. Sigil automatically does what it can to convert/translate text as utf-8/16. If the character encoding on the original document is unknown (or the charset declaration is incorrect), that's where the weird characters usually get introduced.
It's true that SOME special characters/entities are hard/impossible to see in Sigil, but  is just not one of them. It's usually special unicode space codepoints that are hard to locate visually.
Last edited by DiapDealer; 11-03-2012 at 10:05 AM.
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