Files with 4b3 file extension might be found as part of STABCAL program.
4B3 file extension - STABCAL data
What is 4b3 file? How to open 4b3 files?
File type specification:
The 4b3 file extension is used for one of the files in the STABCAL - an older stability calculation for aqueous systems software. Seems like one of the supporting files.
This 4b3 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.