A schematic diagram for Apple hardware (board 820-01041). Shared as “MacBook Pro 15 Touch Bar 2018 820-01041 X1190.rar” — a .rar file, 4.96 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 @Laptopbiossolutions. 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)