Archive in RAR format, about 1.73 MB, named with the bare code 5YXSV-RH-02. The board code and RH-02 suffix suggest a specific board revision, but no maker or document type is mentioned. It appears to duplicate the 5YXSV-RH02 file of the same size. Unpack it to find out whether it holds a BIOS image, a schematic or something else. Check that the printed board number and revision agree, and keep a backup of any SPI flash before reprogramming.
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)