A RAR archive of about 1.03 MB for the Xiaomi Mi CC9 Pro smartphone. The name states the model but not the contents, board revision or version, so extract it and identify the files before use. Packages of this size usually carry schematic or layout documents, which help a technician trace PMIC outputs, follow charging and display lines, and locate the components around a short. Compare the board markings with the documents first, since the board revision printed on the PCB must match the drawings.
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.