Conversion of mbp files to epub file format

As far as we know, it is not possible to directly convert Mobipocket auxiliary files (.mbp) to EPUB format (.epub), because they are not the actual ebook, just metadata for the MOBI ebook. If you want to perform mobipocket conversion, it needs to be the mobi to epub conversion, i.e. conversion of proper ebooks file types.

Open MBP file    Open EPUB file