The .bmk file extension is most commonly associated with PowerDVD MovieMark files. This file format was developed by CyberLink to store bookmarks for PowerDVD files.
The BMK bookmark files that are created with this software contain information about a PowerDVD movie, including the timestamps, video information and comments that have been created by PowerDVD MovieMark users. The BMK files do not contain any actual video data themselves.
The BMK files are commonly used to share movie reviews and comments about the associated movie via the Web.
The Microsoft Help software application has also been known to use the .bmk file suffix for its bookmark files.
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If you have additional information about the BMK file format or software that uses files with the BMK suffix, please do get in touch - we would love hearing from you.