An archive of repair files for Sony hardware (board MBX-156). Shared as “IT SERVICE WORLD_MBX 156-ms20-vgn-ar.zip” — a .zip file, 2.89 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 @IT_SERVICE_WORLD. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip