Small ZIP archive of 186 KB for the ASUS X555UJ laptop, without any indication of its contents. At this size it most likely holds a boardview or similar layout file rather than a full BIOS image or schematic, so unpack it and check the file types first. ASUS boards carry a revision marking on the PCB, and since one model can come with several board versions, that marking must match the files before you use them to locate parts, nets or test points.
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 @vinafix_bios. 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