It sounds as if the EPUB itself is corrupted.
7-zip should be able to open it fine (EPUBs are just .zip files packaged in a very specific way).
Hopefully you have saved backup copies of this EPUB.
If not, you should really get into the practice of saving often. And saving multiple "versions" of files before doing any major changes. I personally "Save As" and append [v.1] [v.2] [v.3] whenever I do a complete round of checks to my EPUB (I just spellchecked the entire EPUB = bump version, I just added in new images = bump version, I just fixed all the indentation = bump version, ...).
Therefore, if anything goes wrong, I do not lose too much progress.
Last edited by Tex2002ans; 11-02-2013 at 02:52 AM.
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