An archive of repair files for Sony hardware (board MBX-256). Shared as “vinafix.com_MEC1621 MBX-256.zip” — a .zip file, 2.36 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 @ShareMan_Electronic_Files. 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