mobi
What is a .mobi file?
application/x-mobipocket-ebook
MOBI (.mobi, Mobipocket) is a legacy Kindle e-book format based on a PDB container with compressed HTML and a limited CSS subset. Amazon retired it in favour of AZW3/KFX, but MOBI files remain widespread.
How to use a .mobi file
Use an example .mobi file to test e-book readers, Calibre conversion, and MOBI-to-EPUB migration.