Officially, Mobipocket Reader is the only eBook software recognized by Amazon as the right tool for pulling out metadata stored in an MBP file. The reader creates the supplementary file and saves eBook data into it whenever the user opens the file, edits the book title or author name, adds notes and highlights text, and bookmarks a page. Generally, Mobipocket eBooks are in MOBI or PRC format, which meets Open eBook specifications. Within the online community, however, independent developer Idleloop has created a separate MBP reader that extracts Kindle notes, bookmark links, and other meta-information from the associated file. However, recent changes in the way the Amazon Kindle app stores and secures eBook data, this unofficial MBP reader can't open encrypted EMBP and secured SMBP files. The surest way to access the user-defined metadata in MBP files is to open the eBook in the Mobipocket Reader.
Amazon offers desktop and mobile versions of its Mobipocket Reader, which opens eBooks in the proprietary MOBI and PRC formats. The software creates a supplementary MBP file where the eBook's metadata is stored in an encrypted file format. The file also saves user comments, highlighted passages, and bookmarked pages. Generally, people have mobile apps in their tablets and smartphones that they use to read eBooks. Others have used a Kindle or a Kobo to read eBooks and manage their virtual library. Users can also read their eBooks through the Mobipocket Reader Desktop client on their PC. This desktop application finds the eBook files in the computer, generates a visual line-up of book covers, and keeps an inventory of eBooks that have been downloaded and deleted. It scans the library for new titles and adds those into a virtual folder with the same name through a cloud-based file hosting account.