RAR archive, 1.63 MB, for board code 4MXSP at suffix RH-01, an earlier marking than the RH-011 packages of the same code. Nothing in the name tells whether it is a schematic, a layout or a firmware dump, so treat its contents as unknown until extracted. Earlier and later revisions may differ in parts and routing, so match the PCB marking before measuring against it. Such files are normally used to find test points, follow power sequencing and narrow down shorted components.
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.