RAR archive of 2.76 MB for Wistron board 12289-2, marked spi 2, which indicates the second SPI flash dump from a board carrying two BIOS chips. Wistron numbers projects with five-digit codes plus a revision suffix. The name does not state the laptop model, so verify the board label before use. Determine which physical chip the image matches, check that image size and chip capacity agree, and read the original contents with a programmer before overwriting them.
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 @SCHEMATICWORLD. 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.
7-ZipWinRARThe Unarchiver (macOS)