RAR file labelled 2KM890ME-10, 1.44 MB, the counterpart of a version ending in 20. The name offers only this code, without brand, board revision or document type, so the contents need checking after extraction. If it holds a BIOS image, it is meant to be written to the board's flash chip with a programmer or a vendor tool. Compare the label on the board, choose the right version, and save the existing firmware before overwriting anything.
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)