Someone once said the same thing about Microsoft .lit books when they first came out back in the mid 90s.
When I had my Casio E125, I found other sellers online who sold .lit books.
Since it is a mobi format book, all you have to do is change the extension from azw to prc.
Since kindle is the flavor of the month right now, who knows what the true format might be?
I'll stick with tried and true .lit & .prc thank you and in a few months when people say "kindle, who?" I'll still be buying and reading my ebooks.
Did someone say Franklin Ebook who?
http://www.amazon.com/Franklin-Elect.../dp/B00000JSFS