An archive of repair files for Sony hardware (board MBX-159). Shared as “Foxconn_MBX-159_r1.0-Sony_MS60-1-01.rar” — a .rar file, 3.55 MB.
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 @alischematics. 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.