RAR archive for Sony model M851 on motherboard MBX-217, about 824 KB. No revision is stated in the name, so the revision printed on the board should be compared with the title block of the document inside. Sony VAIO boards are identified by their MBX numbers, which makes the code the main check when picking documentation. A schematic set like this is used to trace power rails, follow the charging and EC circuits, find components on a shorted line and locate measurement points during repair.
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.