I really don't intend to pile on, but there's something no one has explicitly addressed.
If you want to simply view the internals of a given epub, be advised that when opening it with Sigil, it will be "normalized" - which means that files and directories will be re-arranged according to a standard structure which Sigil imposes before it even lets you see the epub. So in certain cases, you will never see the original structure of the epub upon opening it with Sigil. This is well documented.
If this is not what you want, there is a simple work around: Don't use Sigil. Unzip the epub with an archive program, and browse the resulting directory structure with a file browser, and edit the files with your choice of editor, and re-pack the file structure with your preferred zip program.
Horses for courses.
Bleating here because Sigil is what it is, rather than what you expected it to be, is kind of a waste of time all around.
Just sayin'
Albert
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