Firmware for a Sony VAIO board with Sony board number MBX-224, revision 1.1, labelled M960 MP, in a 1.69 MB RAR. MBX numbers are the Sony mainboard identifiers printed on the PCB, while M960 is presumably the internal project code. The small size suggests a compact BIOS or EC dump for SPI programming. Check the board label, compare the image size with the flash chip capacity, and back up the original contents before flashing with a programmer.
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 @biosarchive. 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.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →