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The "B00" is Amazon's ASIN for the ebook. You can use it to find the ebook in the Kindle Store, but it does not help when using file explorer. The .prc is the ebook, the .mbp is for external metadata (e.g. furthest read etcetera).
The filename of sideloaded ebooks depends on the source, Calibre allows you to customize the filename (see Preferences -> Plugins -> Device Interface -> Kinde Fire).
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