Schematic set for the Samsung SM-G991B smartphone, supplied as a RAR archive. It is used to follow power-management lines, charging paths, the display and camera connectors, and signal routing when repairing the logic board. Contents usually open in a PDF reader, though the format inside is not stated in the name. Phone boards can change between hardware revisions, so compare the board markings with the drawings before relying on test points and part references.
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 @schematic_mobile5. 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.