Archive named 2RS780MH-01 with no brand stated. RS780 is the name of an AMD chipset family, and MH-01 may be a board or revision code, though the name does not confirm the exact product. At 1.18 MB it plausibly holds a BIOS image or documentation for the board. Open it and check the contents and any readme. Match the board marking before flashing a chip, and read out the existing firmware first so you can restore it if the image proves wrong.
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 @schematicslaptop. 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)