Quote:
Originally Posted by saoir
but now after zipping it again it won't read. I am guessing that the files structure that I changed don't match the original toc.ncx.
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There are dedicated apps/scripts for repacking an epub file.
Windows:
ePubPack
OSX:
ePub Zip
If you have a Windows machine, you can also simply change the file extension from .epub to .zip, right-click the file and select Open with > Windows Explorer.
This will open the (renamed) ePub in a regular Explorer window and you can update files with drag & drop. Once you're done, simply close the Explorer window and rename the file back to epub.
Quote:
Originally Posted by saoir
But I can't edit the toc.ncx.
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I wouldn't manually edit toc.ncx. Either have Sigil automatically generate a new one, or, if you don't fully trust Sigil, simply edit it by double-clicking it in the Book Browser.
If you're worried about Sigil messing with the file structure, check out the new Calibre Editor, which is integrated in the latest build.
Good luck!