Compressed RAR archive named H0222-SE, roughly 401 KB, whose label gives no brand, device or document type. H0222 appears to be a code shared with several sibling archives (SC, 1, 2), and SE is likely a variant suffix, though its meaning is not stated. Unpack it with WinRAR or 7-Zip to see whether it holds a schematic, boardview or firmware. Before relying on any content, match the code against markings on the actual board, and keep a backup of any chip you intend to reprogram.
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.