ZIP archive for the ASUS X451MA laptop; the name does not say what is inside, and the 3.2 MB size could correspond to a schematic, boardview or firmware set. Unpack it and identify each file before use. Schematics support tracing rails and signals, boardviews help locate parts and test points, and BIOS dumps are written to the SPI chip with a programmer. Match the mainboard revision on the PCB and back up the original flash contents before writing anything to it.
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 @cyberlanelectonik. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip