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DNSB · 08-21-2024, 11:42 PM

I've opened and edited a 800MB epub file with Sigil without issues. Can you try opening the epub with a zip utility ( I use 7Zip under Windows) and see if it reports any errors. As a last resort, you can extract the files into a temp directory and then insert them into a new ePub document in Sigil.

08-21-2024, 11:42 PM	#2
DNSB Bibliophagist Posts: 46,881 Karma: 169810634 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	I've opened and edited a 800MB epub file with Sigil without issues. Can you try opening the epub with a zip utility ( I use 7Zip under Windows) and see if it reports any errors. As a last resort, you can extract the files into a temp directory and then insert them into a new ePub document in Sigil.