ASUS archive covering the M6500Q and M6400QC models at board revision 2.0, with a 16 MB capacity stated in the name, which points to a BIOS dump for a 128 Mbit SPI flash chip. The RAR file is about 19.6 MB, so it may contain more than one image or supporting files. Technicians use such dumps to recover boards that fail to POST after a corrupted update. Check that the revision printed on the PCB matches, back up the existing chip, and confirm the image size fits the installed flash before programming.
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 @nityatechnology2020. 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.