ASUS X455LJ boardview for mainboard revision 3.1, supplied as a 185 KB ZIP archive containing a BVD-labelled layout file. It lets a technician see where each component sits, which nets connect to it and where to probe when tracing rails, signals or a short to ground. Extract the archive and load the file in a boardview program capable of this format, such as FlexBV or a similar viewer. ASUS often revises boards within one model, so check that the revision printed near the board name matches 3.1 before trusting component locations.
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 @boardviewarchive. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.