Sony MS01 project archive of 1.15 MB; the name gives no board number or revision, only the model code and a website tag. Given its size and naming it most likely contains a schematic set for a VAIO board, but contents should be checked after extraction. Related files link MS01 with board MBX-143, so compare with those copies. Use the drawings for tracing rails, signals and test points, and confirm the board marking matches before relying on any value.
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.
7-ZipWinRARThe Unarchiver (macOS)