Schematic archive for the Sony MS70 project, motherboard MBX-160, revision 1.0, packed as a 1.40 MB RAR. MS-prefixed codes are Sony internal project names for VAIO boards, and the MBX number is what appears on the PCB. Extract it and open the drawings in a PDF reader to follow voltage regulators, power-on sequence and data lines, or to find a component causing a short. Confirm the MBX-160 and revision 1.0 markings on your board, since later revisions may change component placement and values.
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.