ZIP of 304 KB for the ASUS X455LD laptop main board, revision 2.1. The name does not say what is inside, though the size fits a boardview layout or a small document set rather than a large schematic. Check that the rev 2.1 silkscreen on your PCB matches before trusting part positions or values. Boardview files open in tools like OpenBoardView or FlexBV and show placement and net connections. Use it to find test points, trace rails back to their regulators and locate shorted parts during repair.
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 @ITHINKHS. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.