RAR archive covering Sony model M930, designation IRX-5100, on motherboard MBX-215 revision SB. Sony marks its VAIO boards with MBX numbers, and the revision string matters because component placement and values can change between revisions. Expect a schematic, maybe with board layout data, for following power sequencing, locating test points and diagnosing no-power or no-display faults. Unpack with WinRAR or 7-Zip and confirm both the MBX number and revision on the PCB match before working from it.
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.