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Book Reader · 07-24-2015, 10:18 AM

I should have started with "off to see the Wizard". You're right, I thought that I had a Kindle DX that not only handles but has its default files as AZW3, but I don't. Where I got that idea I can't remember any longer. The firmware that I have is the latest (and as far as I know the last) Kindle DX update ver. 2.5.8_B004. I think I shouldn't be surprised that Amazon abandons its older customers, everybody else does the same.

I've purchased my DX used so didn't put in much work learning its behavior. It could be that at one point I purchased (or have converted) some books from Amazon, that I have received it in the AZW3 format, and that's how the whole confusion started.
But as I found out and now you've confirmed, the DX will not handle AZW3 files. They will be transferred (Sent to) the device by Calibre but will not show up in the book list, thus are unaccessible to the DX user. (You can read them fine with Calibre). The problem is that Amazon sends converted files back in MOBI format, that Calibre cannot edit. So to edit with Calibre the files have to be converted to AZW3 (or I believe EPUB would also work), and then edited. When the file eventually is sent to the device, there will be a new MOBI generated (Calibre is kind of smart to do that), and that MOBI is the version which will be "Sent to Device". (A simple Windows file check validates this behavior. It's a kind of cumbersome method but at least it works. (I have removed AZW3 as a file that can be handled by the DX device and placed MOBI at the top of the order of file types handled by it.)
So I thank you for your confirmation, and the exact reason why AZW3 won't work with the DX. Is there any other method you could recommend to handle file conversions, (use EPUB to edit!?, and avoid AZW3 like the plague), for the DX with or without Calibre?

07-24-2015, 10:18 AM	#10
Book Reader Member Posts: 10 Karma: 10 Join Date: Jun 2014 Device: Kindle DX	I should have started with "off to see the Wizard". You're right, I thought that I had a Kindle DX that not only handles but has its default files as AZW3, but I don't. Where I got that idea I can't remember any longer. The firmware that I have is the latest (and as far as I know the last) Kindle DX update ver. 2.5.8_B004. I think I shouldn't be surprised that Amazon abandons its older customers, everybody else does the same. I've purchased my DX used so didn't put in much work learning its behavior. It could be that at one point I purchased (or have converted) some books from Amazon, that I have received it in the AZW3 format, and that's how the whole confusion started. But as I found out and now you've confirmed, the DX will not handle AZW3 files. They will be transferred (Sent to) the device by Calibre but will not show up in the book list, thus are unaccessible to the DX user. (You can read them fine with Calibre). The problem is that Amazon sends converted files back in MOBI format, that Calibre cannot edit. So to edit with Calibre the files have to be converted to AZW3 (or I believe EPUB would also work), and then edited. When the file eventually is sent to the device, there will be a new MOBI generated (Calibre is kind of smart to do that), and that MOBI is the version which will be "Sent to Device". (A simple Windows file check validates this behavior. It's a kind of cumbersome method but at least it works. (I have removed AZW3 as a file that can be handled by the DX device and placed MOBI at the top of the order of file types handled by it.) So I thank you for your confirmation, and the exact reason why AZW3 won't work with the DX. Is there any other method you could recommend to handle file conversions, (use EPUB to edit!?, and avoid AZW3 like the plague), for the DX with or without Calibre? Last edited by Book Reader; 07-26-2015 at 06:34 PM.