ZIP package of 9.64 MB for the ASUS X555LD main board at revision 3.1. The contents are not named, though the size suggests a schematic PDF with or without a matching boardview. Revision matters on this model family, since ASUS released several board versions under the same name, so check the rev printed on the PCB before use. With the documents you can follow the power-on sequence, find test points, identify the parts on each rail and narrow down a short or missing voltage on the board.
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.