Small archive for the ASUS X55U laptop, labelled 1.6, likely a board revision, packed in a 99 KB RAR. Given the size and a related file for revision 1.4, it probably holds boardview data rather than firmware, but extract it to confirm. Boardview data shows where components, test points and nets sit, which helps when tracing a short or a missing power rail. Make sure the revision printed on the PCB matches before relying on the layout.
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.
7-ZipWinRARThe Unarchiver (macOS)