Firmware for Sony board MBX-266 with a cleared Intel ME region, for the Intel integrated graphics variant as indicated in the name. The RAR holds a dump meant to be written to the SPI flash with an external programmer. Clearing the Management Engine region is a common fix for boards that start and then shut off or show no image. MBX numbers are Sony's Vaio board codes. Confirm the graphics version on your board, back up the original chip, and match image size to flash capacity.
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 →