Archive for the Sony VAIO VGN-AR71MR notebook in RAR format, about 1.15 MB. The name gives only the model and no board number, ODM code or revision, so the exact contents are uncertain. Packages of this size are typically schematics, which a technician uses to trace power rails, follow the charger and EC circuitry and find components around a short. Unpack it with WinRAR or 7-Zip and compare the board number printed on the motherboard with the one in the documents, since one VAIO model can ship with different boards.
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 @generalschematics. 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.