Schematic archive, as the sch suffix suggests, for the Sony VAIO VGN-FS series motherboard MBX-130, under project code MS02. Another file for the same board carries MS01, so the two may be different design versions and should be matched to the PCB. At 1.22 MB it likely contains a PDF schematic. Use it for tracing power rails, verifying charger operation, checking the clock generator and locating components around a short. Extract it with any RAR-capable archiver.
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.