An archive of repair files. Shared as “HITACHI - CDH-LE32SMART04 - 5800-A8R16B-1P00 - Upgrade.rar” — a .rar file, 83.1 MB.
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 @led_software. 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)