.$b5 is ProDOS 16 or GS/OS shell application
Key Features: .$B5 File Extension
What is an .$B5 file?
The $b5 file extension is associated with the ProDOS, an operating system, for Apple II computers.
ProDOS was the name of two similar operating systems for the Apple II series of personal computers. The original ProDOS, renamed ProDOS 8 in version 1.2, was the last official operating system usable by all Apple II series computers, and was distributed from 1983 to 1993. The other, ProDOS 16, took advantage of the extra capabilities of the 16-bit Apple IIgs, but was short-lived and replaced by GS/OS within a year.
The $b5 file contains Shell application.
This $b5 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.