A sar file extension is related to the Yamaha S.Art voice file format. Probably obsolete file format.
SAR file extension - Yamaha S.Art recorded voice
What is sar file? How to open sar files?
The sar file extension is associated with the Yamaha S.Art audio file format used by Yamaha audio devices and audio software.
The sar file stores voice that can be included in a music composition created on Yamaha accessories.
This sar 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.