Boardview for the ASUS P8H77-M LE motherboard, revision 1.04, delivered in ASC format inside a RAR archive of about 441 KB. After extraction it shows component placement on both sides of the board with net names, so you can find a shorted capacitor, follow a power rail to its MOSFETs or locate the SPI BIOS chip and its test points. ASC boardview sets are typically opened with programs like OpenBoardView, FlexBV or Boardviewer. Make sure the REV marking on your board reads 1.04, since layouts shift between revisions.
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 @boardview. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.