
: Re: How is an epub structured internally? I know from sources I do not remember anymore, that an epub file is a valid zip file containing (among other files) chapters as *.xhtml files, a manifest
An EPUB file is just a zip file. Copy mybook.epub to mybook.zip, and use your favorite zip tool to open the zip file. You should see some XHTML files and images somewhere in there, along with an OPF file, manifest, and some other control files. Windows 7+ natively treats zip files as a folder.
XHTML is similar to HTML but is more strict, and the bold and italic tags are different.
Below is a screen shot of a test2.epub I copied to test2.zip. The screenshot only shows the root dir of the epub.
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