An archive of repair files (board LA-6552P). Shared as “5252-pew76(pew96 la-6552p REV 1).rar” — a .rar file, 1000 KB.
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 @one5technology. 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)