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jackie_w · 05-03-2022, 05:28 PM

If your epub is epub3, I think epubcheck expects all your text files to have the .xhtml extension. I don't think it has the same requirement for epub2.

The calibre Editor does have a built-in option called 'Change the file extension for the selected files'. To access it, in the File browser pane, select all the text files you want to change then right-click and select the option from the pop-up menu. I believe the option automatically makes any related changes required in other files in the epub (e.g. OPF, links etc) to keep everything consistent.

05-03-2022, 05:28 PM	#2
jackie_w Grand Sorcerer Posts: 6,252 Karma: 16544692 Join Date: Sep 2009 Location: UK Device: ClaraHD, Forma, Libra2, Clara2E, LibraCol, PBTouchHD3	If your epub is epub3, I think epubcheck expects all your text files to have the .xhtml extension. I don't think it has the same requirement for epub2. The calibre Editor does have a built-in option called 'Change the file extension for the selected files'. To access it, in the File browser pane, select all the text files you want to change then right-click and select the option from the pop-up menu. I believe the option automatically makes any related changes required in other files in the epub (e.g. OPF, links etc) to keep everything consistent. Last edited by jackie_w; 05-03-2022 at 05:33 PM.