[Rellwood]

Yeah they are the mbp files that allow for the use of the extra functions on the kindle. And yes, they are downloading as an extra book.

However, it seems that my "invisible" files that I thought were just the .opf for books was actually the books.. I was expecting to see the metadata but when I discovered that there were books too I was kind of shocked because when I open the folders to download them, they are empty, but I end up with a perfectly formatted and with metadata book. Although, I download each author individually.