Amazon has another tool, the
Kindle Textbook Creator, that can create interactive multi-media textbooks starting with a PDF file. It packages books for uploading to Amazon in Kindle Package Format (KPF) and these .kpf files can also be opened by the new Previewer 3.0 beta.
After trying the Textbook Creator out I examined a KPF file and found that it is just a zip file containing a KDF book, similar to what the Previewer beta creates for enhanced typesetting. I'm guessing that once the KPF is uploaded to Amazon it will be delivered to customers as a KFX book.
I experimented a bit and discovered that you can turn an enhanced typesetting book created by the Previewer beta into a KPF file that you can re-open later using just a few steps:
- After converting a book using the Previewer locate the directory within your temp directory that holds the results. It should have 'book' and 'conv_metrics' subdirectories.
- Rename the 'book' directory to 'resources'.
- Zip the 'resources' directory using your zip utility of choice. You want a zip file that contains that directory name in it.
- Rename the zip file to have the extension '.kpf'.
You can now open the KPF file using the Previewer.