[tompe]

Originally Posted by davey

Thanks. I think that's why my first attempts seemed to do nothing at all. When I came back to it today, I used all lowercase by chance and started making some progress.

In retrospect it was a pretty stupid idea to use capitalization in the output but not in the input. I hate capitalization in inputs so I should have used only lower case in the output also.

Is the binary Mobipocket format documented anywhere, or did you just reverse engineer it, so to speak?

I reverse engineered it with some input from igorsk. The documentation is not available so there are guessed made about the format so you cannot trust the tools 100%.