ASUS K50C archive, 159 KB in RAR format; the name gives only the laptop model, with no board revision or document type. A file this size could hold a boardview or a compact set of service data, so extract it and check what is inside. Repair documents for a notebook board are typically used for tracing power rails, locating components and test points, and checking for shorts. Compare the board number and revision printed on the PCB with what the contents describe 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 @IT_SERVICE_WORLD. 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.