RAR archive of service material for the ASUS A8J and A8F notebook family, judging by the A8J.F naming, at about 2.11 MB. The name does not state what is inside, so expect a schematic, a boardview or both and open it to confirm. Technicians use such documents to trace power rails, find the charger and regulator circuits and locate test points while diagnosing no-power or no-display faults. Before relying on it, compare the board revision printed on the PCB with the revision shown in the documents, since ASUS changed layouts 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 @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.