RAR archive of 2.40 KB carrying the code 09513 and the suffix SB, with no model name or explanation of its contents. The five-digit code resembles Wistron project numbering. The very small size means it can only contain a short data dump, such as a small EEPROM image, or a text file, not a full BIOS. Open it to verify what is inside, match it to the board marking and chip type, and back up the original chip with a programmer before attempting any write.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @schematicslaptop. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)