Quote:
Originally Posted by Dr. Drib
"Swann's Way" is 444 kb, which is less than the 500 kb you mention. (I don't know how to calculate the XML file that you mention.)
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An advantage of ePub files is that they are also zip files. Rename the file (or a copy) from .epub to .zip and unzip it. The OPS subdirectory contains the bulk of the ebook, including main5.xml (Part 3) at 508 KB and main3.xml at 361 KB.
It is possible to manually split these files into two, update fb.opf to track the change and recreate a new ePub, but I don't expect it will be very long before Feedbooks create new versions of their Proust ePubs with smaller XML files.