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Snekguy · 05-03-2022, 04:39 PM

I hope this is the right place for this question.

So, I've been publishing via Smashwords for several years now, and they seem to have made some changes to their file requirements recently that are preventing me from passing their EPUBcheck validation.

I've always used Calibre, and it's great, I have a good workflow set up and I have a decent understanding of the program. I publish on Amazon too, and I have no issues over there.

One of the errors that EPUBcheck is throwing out is "XHTML Content Document file name "01.html" should have the extension ".xhtml".

All of my chapters are HTML files, and that is now apparently an issue for Smashwords. I tried renaming the file extensions, which just produced blank pages on some readers (but not others?) and I tried converting the files using automated tools to no avail.

I noticed that some of the files within the EPUB that Calibre generates are XTHML by default, and I was wondering if Calibre has any built-in tools or plugins that might help me out? Is there some simple option I'm missing?

05-03-2022, 04:39 PM	#1
Snekguy Junior Member Posts: 5 Karma: 10 Join Date: May 2022 Device: none	Calibre and XHTML files I hope this is the right place for this question. So, I've been publishing via Smashwords for several years now, and they seem to have made some changes to their file requirements recently that are preventing me from passing their EPUBcheck validation. I've always used Calibre, and it's great, I have a good workflow set up and I have a decent understanding of the program. I publish on Amazon too, and I have no issues over there. One of the errors that EPUBcheck is throwing out is "XHTML Content Document file name "01.html" should have the extension ".xhtml". All of my chapters are HTML files, and that is now apparently an issue for Smashwords. I tried renaming the file extensions, which just produced blank pages on some readers (but not others?) and I tried converting the files using automated tools to no avail. I noticed that some of the files within the EPUB that Calibre generates are XTHML by default, and I was wondering if Calibre has any built-in tools or plugins that might help me out? Is there some simple option I'm missing?