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AWP at least, does not store its files in epub format. It publishes its files to epub and can not edit them when published.
You can use Sigil, an open source program, to edit actual epub files. Sigil has extensive search and replace facilities and an excellent spell check. It can generate both an epub toc and a hyperlink toc as well. It takes in html, txt and epubs.
Sigil handles the bundling of all the files together and is set up to allow reuse of images, especially important if you are using a graphic over and over between paragraphs or at chapter heads.
No one program currently available does everything...as it is Sigil uses a million lines of code to do what it does. Sigil only does epub2 and currently only does not destroy epub3 commands put into the file.
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