Archive named 5LXWL-RH-10, a RAR of roughly 1.55 MB, sharing its code family with the RH-11 variant but ending in 10. The name does not say which device it belongs to, so its purpose must be confirmed by checking what is inside and comparing it with your hardware markings. Firmware packs like this are usually written with an SPI programmer. Always back up the existing chip contents, check the image fits the chip capacity, and verify after writing so you can recover if the dump is 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.