Compact 53.6 KB RAR labelled ze550kg, a model code in the style used for ASUS ZenFone handsets, though the name gives neither the brand nor the type of content. Its size suggests a boardview, point map or small schematic excerpt rather than a firmware package. Extract it and check the file extension to choose a viewer. Repair technicians use such data to locate parts, test points and short-circuit paths, but should first confirm the model printed on the board matches.
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 @schematicslaptop. 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.