Boardview in .cad format named X1403ZA 2.1, which most likely denotes an ASUS X1403ZA board at revision 2.1, although the name gives no brand. CAD-type layouts like this open in viewers such as FlexBV, Boardviewer or OpenBoardView and show component outlines, pin names and connected nets on both sides of the PCB. Use it to locate parts, test points and shorts quickly. Confirm that the model and revision printed on your mainboard match before trusting part positions.
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 @notebookschematic. Enginerys does not host this file.
How to open a .cad file
GenCAD text export, the usual format for Compal, Quanta, Wistron and Dell / HP / Lenovo laptop boards.