BMK file format is used by PowerDVD addon developed by CyberLink. BMK files store information about movies along with reviews and user comments. Tool for managing BMK files is a paid software that supports many video formats, including Blue-ray and 3D movies.

BMK bookmark files are called MovieMarks and can be shared among users over the internet or via email. BMK format was never really popular among movie reviewers, mainly due to being supported by only one software program.