Quote:
Originally Posted by Jellby
It's not a file, it's a directory (folder), and it's "META-INF" (case-sensitive, and with a hyphen). It's mandatory, because it must contain a file named "container.xml", which defines where the main OPF file is located. It is this OPF file that defines all the other ePub contents and structure. Maybe ADE and calibre have some way of finding the OPF file on their own, but without "META-INF" the ePub is definitely invalid.
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I wimped out & did an epub to epub convert with calibre, It is OK now.
but out of curiosity I opened what is now the original_epub file in winrar. & I see all of that "missing" stuff - the META-INF folder, and inside that the container.xml.. so sigil's error message is misleading.
I cannot post the file for copyright reasons but if anyone wants to did deeper juse PM me with an email to send it to