Compressed RAR archive of about 6.12 MB for the Xiaomi POCO X3 Pro smartphone. The name gives only the model, with no hint of whether schematics, a boardview or service layouts are inside, so open it before planning a repair. Material like this is used to trace PMIC outputs, charging and USB paths, locate test points and narrow down shorted capacitors. Extract it with WinRAR or 7-Zip, and compare part markings and board revision on the actual phone with the drawings before relying on them.
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.