(registered 2026-08-10, last updated 2026-08-10)

Media type name: audio

Media subtype name: vnd.opennbs.nbs

Required parameters: N/A

Optional parameters: N/A

Encoding considerations: binary

Security considerations: This media type represents a binary song project file. Implementations should validate all lengths, counts, and offsets before use. Malformed files may result in excessive memory allocation or resource consumption if not properly validated. The format contains no executable code and is not intended to carry active content.

Interoperability considerations: Files are versioned. Readers should reject unsupported versions or ignore unknown fields according to the file format specification where possible.

Published specification: https://noteblock.studio/nbs

Applications which use this media:

Note Block Studio
NBS Player
NoteBlockLib
nbs.js
pynbs
Note Block Tool

Fragment identifier considerations: N/A

Restrictions on usage: None.

Additional information:

1. Deprecated alias names for this type: N/A
2. Magic number(s): N/A
3. File extension(s): .nbs
4. Macintosh file type code: N/A
5. Object Identifiers: N/A

Person to contact for further information:

1. Name: OpenNBS Project
2. Email: opennbs&gmail.com

Intended usage: COMMON

Author/Change controller: OpenNBS Project