RAR archive of 53.6 KB labelled ze550kg, matching the ASUS ZenFone ZE550KG model code, with no detail in the name about whether it holds a boardview, schematic or other service data. The small size hints at a layout file or brief document. Unpack it and identify the format; boardview files open in tools such as OpenBoardView or FlexBV for finding parts and test points. Confirm the PCB revision of the handset before trusting component placement or signal paths.
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.
7-ZipWinRARThe Unarchiver (macOS)