The 4B3 file extension is used for one of the files in STABCAL - an older stability calculation for aqueous systems software. Seems like one of the supporting files.
Help how to open 4B3 files:
This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.
How to convert file with extension 4B3:
As far as we know, this .4b3 file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.
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