An archive of repair files for Xiaomi hardware (board 6050A2940901). Shared as “R15-6050A2940901-MB-A01.rar” — a .rar file, 330 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 @boardsscanrepo. 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)