RAR archive, 2.09 MB, for board code 3CESL at revision suffix RH-14, the highest in this group of 3CESL files. The name does not specify whether a schematic, boardview or BIOS image is inside. Unpack it with WinRAR or 7-Zip to check. A same-size copy named without hyphens also exists. Technicians use this kind of material to trace power rails, find shorted parts and locate test pads, but the revision on the actual board must match for placement and values to be reliable.
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.