PW2 How to invoke native reader from file browser?

Hello,

I would like to know if it is possible to invoke Kindle native reader from some kind of file browser/explorer.

KUAL has Explorer extension. Coolreader has a built-in file browser. KOreader has a filemanager.

Coolreader/KOreader work great for me to traverse my file structure to locate and read my ePubs.

However, for some books I need native Kindle reader to use Amazon dictionaries and Vocabulary Builder. Unfortunately, with a large number of books, using built-in book list is very inconvenient. (I know about various methods of organizing collections, etc., but still prefer my own file structure that I can easily sync between devices.)

I tried KUAL explorer extension, but it did not seem to invoke any readers.

Is there some feature/extension/native package that I overlooked?

Thanks!

PW2 5.6.1.0.2; JB/KUAL/the works