Files with fab extension seems to have been once used by the old Fabmaster software. It looks like the program, much like the format, are no longer activelly used or further developed.
There is one other file type using
the FAB file extension!
.fab - Fab@Home fabber model
FAB file extension - Electronic Source Company Fabmaster data
What is fab file? How to open fab files?
File type specification:
The fab file extension is associated with the Fabmaster software, or file format developed by the Electronic Source Company.
Fabmaster seems to be obsolete product that is not supported by its developers.
This fab 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.