A RAR archive of about 932 KB for the Xiaomi Mi 2S. The name carries no document type, board number or revision, so check the contents after extraction. The index also lists a separate ZIP of Mi 2S schematic diagrams, and this package may hold the same or similar material. Schematics of this phone help a technician trace supply rails, follow the battery and charging path, and find components near a short. Match the board markings against the sheets before relying on component locations or values during repair.
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 @cyberlanelectonik. 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.