An archive of repair files for Motorola hardware. Shared as “Moto G4 Plus - XT1640 - XT1641 - XT1642 - XT1643 - XT1644.rar” — a .rar file, 1.36 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 @esquemaseletricos. 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)