RAR archive, 2.19 MB, named for the code 3AESV-RH-12, which looks like a board identifier at revision RH-12. The name does not indicate the brand, model or whether the package holds firmware, a schematic or a boardview. Open it with WinRAR or 7-Zip to find out. Related uploads exist for revisions RH-10 and RH-11, so pick the one matching the marking on your PCB. For any flash image, back up the original chip with a programmer and confirm the file size equals the chip 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 @cyberlanelectonik. 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.