Boardview archive of 316 KB named only X415KA, which matches an ASUS laptop model code, though no board number or revision is given. Since the PCB revision is unknown, compare the markings on your mainboard with the layout before trusting part locations. Opened in FlexBV, OpenBoardView or a similar program, the file shows component placement, net connections and test points, which are useful for tracing power rails and checking shorts 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 @BoardSchematic. 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.
7-ZipWinRARThe Unarchiver (macOS)