An archive of repair files for Apple hardware (board 820-00194). Shared as “f40d7200c_juc7-820-00194894_c400f17-e63-c.rar” — a .rar file, 3.93 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 @tvsoftwareworld. 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)