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ColMac - Curious - what formats did you convert from and to?
The editor's Reports Tool can provide a list of the characters used in a book, I use it to determine if a book has any 'unusual' characters and track them down of necessary (it's a clickable list):
The list at the bottom, and individual cells (e.g the codepoint value), can be copied to the clipboard which can be handy at times.
BR