A brsar file extension is related to the audio format used by Wii and Sony PSP.
BRSAR file extension - Audio data
What is brsar file? How to open brsar files?
File type specification:
The brsar file extension is associated with audio file format used in some games for Nintendo Wii and Sony PSP consoles.
Seems to be very rare used or obsolete file format.
This brsar 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.