A schematic diagram (board 12307-2). Shared as “12307-2 [DIAGRAMAS.COM.BR].rar” — a .rar file, 3.98 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 @bartonarquivos. 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)