.BNP File Extension
Sony Camcorder Video Data File
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What is a BNP file?
Data file created by some Sony digital camcorders; stored within the AVF_INFO directory on the camcorder and contains metadata about the recorded videos; used for displaying information on the camcorder such as the dates and number of videos recorded.
If you delete the files in the AVF_INFO directory, the recorded camera files will not play back correctly. However, you can still transfer the video data to a computer.