For future reference: please note that the folders shown in the Book Browser are only a virtual representation of file-types contained in the epub archive (starting with Sigil 1.0). The fact that an 'Images' folder appears there does not, in fact, mean that there's an 'Images' folder present in the epub's archive. There could be one, but the fact that cover.jpg appears under the virtual 'Images' folder only means that Sigil knows that cover.jpg is an image.
The tooltip, when hovering over a file, shows the actual file path within an epub's archive. You can also set the full path of all files to always show in Book Browser in Sigil's preferences. Doing so can help to reinforce the idea that Book Browser is a representation of an epub's various file-types and is not necessarily indicative of its internal folder structure.
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