RAR archive of 1.23 MB named after the ASUS G501JW laptop, with an RG suffix whose meaning is not explained in the name. The contents are not described, so it may hold a BIOS dump, boardview or schematic material for this model. Open it and identify each file before use. If it contains a firmware image, back up the existing SPI flash with a programmer first and make sure the dump size matches the chip, and if it holds board documents, compare the board revision printed on the PCB.
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.