Unlabelled-type archive, 2.09 MB, named 3CESLRH131, which may denote revision 13.1 of the 3CESL RH series, although that reading is not certain. No brand or model appears in the name. Open it to see whether it contains a firmware image or documents. Compare it with the RH13 and RH14 files of the same family. Save the original chip contents before programming, and make sure the image size matches the flash device.
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)