Quote:
Originally Posted by Snauzoo
...when I looked at this book in ADE, the black marks appeared as ? marks...
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This happens when there is confusion about the font encoding during format conversion. It often happens when text files are converted to ebooks and the conversion software doesn't recognize the font encoding correctly (and guesses wrong) or needs to have the encoding set manually and the user fails to do so or do it correctly. Most ebook reading software displays a question mark or a special glyph (e.g. question mark in a box, ...) when it encounters a character it doesn't understand. The vertical bar is apparently what the software you are using on your iPad uses in such cases.
When you try to convert the contents of your ZIP file pay attention to the encoding setting in the conversion dialogs. Many encoding schemes are referred to as "code pages" and are often listed as "cp1252" or other numbers.
If you don't know the source encoding its a matter of trial-and-terror. Try conversions with different encoding settings until to hit on the correct one.