Files with bbox file extension might be found as very old "classic support files".
BBOX file extension - Classic support data
What is bbox file? How to open bbox files?
File type specification:
The bbox file extension seems to have been in the past used for "Classic support files". No further information about this file type could be found, so it is likely no longer used and thus obsolete.
This bbox 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.