Compressed RAR file of 1.66 MB labelled 4MXSP-RH011, matching the 4MXSP-RH-011 entry in code and size and probably a duplicate of it. The name gives no description of the files inside. Open it with 7-Zip or WinRAR and check before use. If a BIOS or EC image is included, check that its size equals the flash chip capacity, because a mismatched image will not fit. Read and keep the original chip contents with a programmer before flashing anything to the board.
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.
7-ZipWinRARThe Unarchiver (macOS)