RAR archive named only H0223-3, with no brand, model or document type in the name. The 289 KB size suggests a schematic or boardview rather than a full firmware set, but the contents must be checked after extraction. H0223 is likely an internal project or board code, but its meaning is not stated. Open the files, compare any board number inside with the PCB silkscreen, and only then use the material for tracing rails, locating parts or diagnosing a short.
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)