An 892 KB RAR archive for the Sony MBX-226 motherboard, with no further details in the name such as model, ODM or revision. Other sources link this board number to the VAIO VPC-CW line, but check the title block inside to confirm. A Sony MBX package of this size usually contains a schematic PDF useful for following power rails, reading component values and locating test points. Before trusting it, compare the board number and revision printed on your PCB with the drawings.
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.