RAR archive of 2.11 MB for the ASUS A8F laptop, marked SC, which likely denotes a schematic; it is a numbered copy of a similarly named file and differs slightly in size, so its contents may vary. The name gives no board revision. Technicians use such circuit diagrams to follow rails from the DC jack through the charger to the regulators and to find signal routing between chips. Unpack it and review the pages in a PDF reader, matching the board revision before trusting values.
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 @cyberlanelectonik. 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.