is a format developed by the International Digital Publishing Forum. It is characterized by the XML- and XHTM-based optional use of CSS styling. The main feature of this format is the use of reflowable text (word wrap) which makes it possible to adapt the image to different device displays. The ePub file is a zip-archive with an .epub extension.
To decompress a DBK file outside Sony Ericsson PC Suite, the user should rename the file extension to .ZIP and open it with a .ZIP decompression utility. DBK files are also associated with FJ Software Development's MyPhoneExplorer, which can also be used to manage a Sony Ericsson mobile phone.