RAR archive labelled 3CESL-RH-01. The name gives no brand, device or file type, only what appears to be a board code with a revision field. Its size of about 1.9 MB is typical of a firmware image or a compact documentation set, so open it to see what it holds. Compare the code with the marking on the board you are repairing, because related versions such as RH-10 exist under similar names. Keep a copy of any chip contents before programming.
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)