An mbj file extension is related to the Yamaha SoundEdge sound card. An mbj file stores EffectGear data.
MBJ file extension - EffectGear data
What is mbj file? How to open mbj files?
File type specification:
The mbj file extension is associated with the Yamaha SoundEdge, a sound card for IBM-PC computers, based on YMF278 sound chip.
The mbj file contains EffectGear data, probably software for SoundEdge.
This mbj file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.