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Thank you both for your helpful comments. I investigated a bit further and found out that this epub file is empty! It has a size of 0 KB. I tried changing the extension to .zip and trying to extract in Windows and Windows told me it was empty.
I have other files with similar problems but they are not empty. However Zip 7, Winzip, Windows, and Sigil cannot open them - seriously I get errors when trying to open.
Finally when trying to open 1 of these files, Sigil itself started being unable to work. I got this error from Sigil:
Error info: Critical: QWindowsBackingStore::flush: BitBlt failed (The handle is invalid.)
Sigil version: 0.7.2
Runtime Qt: 5.0.2
Compiled Qt: 5.0.2
Platform: Windows SysInfo ID 144
It also tried to force me to report it, but this bug tracking on the Sigil site is apparently closed, so I had to force shut Sigil. Then guess what? Although Sigil does not show in Applications in Task Manager (Windows 7), I had 2 Sigils running in processes and they were hogging up all my CPU. So finally I had to restart to get out of this mess!
Anyway I now understand your advise to Save Before Sigil-ing!, however epub is really turning into too much of a hassle for me - unless I just use it on my phone. I don't understand why the group of companies that created or runs epub format haven't come up with a native way to allow users to highlight and annotate their epub books! This is all I want to do.
For my purposes Kindle is the best. But it is a little confining. I would prefer to be able to notate a book however I want - like a real book - but you have to compromise in life and ebooks have huge advantages over real books. Plus unfortunately not all books are available as Kindle versions. PDF is not really that bad since Adobe allowed highlighting and annotations in Reader, plus the android version of Reader works pretty well. Maybe I can get away with just these 2, but do any of you have any suggestions for other formats that would be more conducive to highlighting and annotations?
Thanks
Dan
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