Thank you, guys.
But didn't work because the language of files (portuguese).
The accent doesn't works.
Exemple:
Before: Quanto ao plano estático da apresentação
After: Quanto ao plano estético da apresentação
This happened with Kindlegen.
I tried to convert in Calibre without compression. In Pc, works fine. But in the Kindle, don't. =/
I'm a terrible user, i can not edit file per file. I don't know to do works. :/ (Appeared more than 70 errors and i can't fix them!!!!)
I should bought Kobo!