I've installed the latest firmware on my PW2 and did some "research" using a free Word Wise enabled Kindle book,
A Tale of Two Cities.
When I downloaded this book, I noticed that an additional SQLite database file with a .kll extension was downloaded to the .sdr folder of the book:
Code:
/A Tale of Two Cities_B004EHZXVQ.sdr/LanguageLayer.en.B004EHZXVQ.kll
The actual Word Wise definitions are apparently stored in another SQLite database (with obfuscated definitions) in the following hidden system folder:
Code:
/system/kll/kll.en.en.klld
BTW, Word Wise doesn't affect Kindle book authors/producers at all since the definitions are automatically generated. I.e., existing books won't need to be updated.
When enabled, Word Wise will change the line spacing of
all lines of a paragraph, even if no definitions are being displayed above a particular line.
However, if Word Wise is disabled, Word Wise enabled books are being displayed like any other Kindle book.