Duplicate-looking RAR archive of 2.43 MB, named for board code 3CESV with the RH-01 suffix plus a (1) tag that usually marks a second saved copy. The name does not reveal the contents, so open it with 7-Zip or WinRAR and compare it with the untagged file. Do not confuse 3CESV with the 3CESL code, which appears to be a different board. Use the material for rail tracing, component location or short hunting only after matching the PCB marking.
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)