Have a little patience
Kindlegen is an awful product, Amazon should be ashamed of themselves. Just because it's free is no excuse for not even taking the trouble to release a Windows version. Running in a DOS box is simply out of the Ark and demonstrates that Amazon are only interested in restricting the freedoms of their customers.
Calibre is a great format convertor and they are working on a KF8 conversion as you read this. I have no doubt that it will deal with Sigil output in a thoroughly sensible and professional way (Amazon take note!). This is a big job since KF8 itself is a dog's breakfast, even if it will eventually stumble on a way to do things properly. On past performance, I expect Calibre to come up with a first version of a KF8 convertor within a month.
If you use Calibre, please consider contributing financially. It's your main defence against the incompetence of Amazon.
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