BNSF File

What are BNSF files and how to open them

Are you having problems opening a BNSF file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your BNSF files.

What is a BNSF file?

A .BNSF file is a BNSF Audio file.

BNSF Audio files store streamable audio used in video games by Namco Bandai (CyberConnect2). These files hold compressed voice, music, or ambient sounds as game assets. A file of this format begins with a header that describes how the audio is encoded and how it should be played or looped in the game.

These files are exported by game development tools from Namco or CyberConnect2 and played back at runtime via the game engine. They often use the ITU-T G.722.1 annex C codec (also known as Siren-14) or G.719 codec. The audio is usually lossy compressed with support for mono or stereo channels. Some BNSF files include loop-information metadata so that a segment of the audio can repeat seamlessly. Open source tools like vgmstream provide decoding support.

The file begins with the ASCII header "BNSF" at offset 0, followed by "IS14sfmt" at offset 8, indicating the format structure. Also present is "sdat" at offset 40 to mark part of the data section. These signatures help decoders and tools recognize the format.

How to open BNSF files

Important: Different programs may use files with the BNSF file extension for different purposes, so unless you are sure which format your BNSF file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 24, 2026

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