RAR archive of 2.45 MB whose short name, a271, gives almost nothing away: no brand, model or file type is stated. It may refer to a board numbered something like NM-A271, but that cannot be confirmed from the name, so treat the contents as unknown until extracted. Archives of this size in repair collections usually hold a schematic PDF, a boardview or a BIOS dump. After unpacking, identify each file by its extension and check any board number inside against the markings on the PCB before using it for diagnosis or flashing.
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 @schematiclaptopramkushwaha. 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.