Compressed RAR archive for the ASUS VivoBook E203NA, 5.36 MB, with the name giving only the model and no indication of what is inside. It could hold a BIOS dump, a schematic or a boardview, so unpack it to see the actual files. Check the board number and revision on the PCB against any documents inside before relying on them. For firmware, read and save the original SPI chip contents with a programmer before writing, and confirm the image size matches the flash chip capacity.
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 @laptopbios21. 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.