A bon file extension is related to the Binary Object Notation Document format, used to store serializing data for storage or communication.
BON file extension - Binary Object Notation Document
What is bon file? How to open bon files?
File type specification:
The bon file extension is associated with the Binary Object Notation Document Format, a binary file format used for serializing data for storage or communication.
Seems to be obsolete file format.
This bon 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.