Archive with schematic material for the ASUS A8F notebook, where SC most likely stands for schematic. The 2.07 MB RAR has to be unpacked to see whether it holds a PDF or another drawing format. Board-level diagrams like these help a technician follow the power-on sequence, measure supply rails and locate shorted components on the A8F main board. The name gives no board revision, so compare the revision printed on the PCB with the one in the drawing title block before trusting part locations or 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 @schematicslaptop. 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.