An rdfs file extension is related to the SemanticWorks software and used for its data files.
RDFS file extension - SemanticWorks data
What is rdfs file? How to open rdfs files?
File type specification:
The rdfs file extension is associated with the SematicWorks, a software for Microsoft Windows operating system that allows users to visually design Semantic Web instance documents, vocabularies, and ontologies.
The rdfs file stores some kind of data used by SematicWorks.
This rdfs 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.