[jhowell]

Originally Posted by KindleAZWorKFX

is the KFX output plugin in calibre already older than the release on kindle's website?

The KFX Output plugin was last updated on January 29. There have been four new releases of the Kindle Previewer since then. I am not in a hurry to release a new version of KFX Output since the current release works properly with the newer versions of Kindle Previewer, other than reporting an unknown version in the "launching" message. I prefer to not update the plugin more than once a month unless there is a serious problem that needs to be corrected.

Originally Posted by KindleAZWorKFX

Also, I was getting a KPF file is missing message at the end of the ePub output, was able to fix this by converting the ePub format into Kindlegen console app, had dragged the ePub onto it and then imported the outputted Mobi file, and used KindleUnpack plugin into an outputted ePub 2 format eBook and did the converting again to KFX output this time it didn't get that error. so doing this seemed to of fixed that error, also the first time I had my pc offline but unless kindle previewer 3 is required to stay online to convert files, that should not of been the problem. I did check the ePub eBook with calibre eBook editor, using check eBook F7 within edit book T feature, it didn't find any problems but nevertheless it got an missing KPF message the first time, so it must of been something in the code that Kindlegen removed that might of fixed it, not sure exactly but that's how I was able to make a failed KFX, process without an error this time anyway.

The "KPF file is missing" error occurs when the Kindle Previewer fails to convert a book to KPF but does not produce an error message explaining why. There are various things in the EPUB being converted that can trigger this to happen. The Kindle Previewer has bugs. Even if an EPUB is technically valid it may not be acceptable to Amazon's conversion software.

As you have found converting to another format and then back to EPUB can sometimes change things enough to work around whatever is causing the failure to convert.

Originally Posted by KindleAZWorKFX

I got that Open KFX with Kindle Previewer 3.bat file, used a public domain project Gettysburg eBook converted from ePub to KFX, which has a short table of contents in it, but in under Book Information is saying Table of Contents not specified message, is that normal for the outputted KFX plugin or is that a bug? it shows the table of contents in Kindle Previewer, it's just the Book Information from it. Enhanced Typesetting is supported Cover is Specified and NCX is Specified, Start Reading is Not Specified, Content Language is enlish or en for that, so all the rest looks normal I was just not sure about Table of Contents, it has Table of Contents in Ebook, but the Book Information just says it's Not Specified.

An e-book in EPUB 2 format will typically have two different tables of contents. The inline table of contents is part of the text of the book. And the logical table of contents is metadata that is used to generate the table you see when you open the Go To menu on a Kindle. EPUB 3 allows a single file within the EPUB to serve both purposes.

The Kindle Previewer will show Table of Contents Not Specified in the Book Information display if the metadata of the EPUB that was converted lacks a pointer to the inline table of contents within the book's text. That is a common situation and does not cause any problems because that pointer is only used as a fallback if the book lacks a logical table of contents.