RAR archive named N301Z, a model designation with no board number, revision or graphics variant mentioned. At 1.39 MB it likely contains a schematic or boardview package for the mainboard of that notebook. Since the name is sparse, inspect the contents first and confirm that the ODM project code printed on the PCB matches. Such documentation helps with tracing power rails, locating test points and checking shorted components. Extract it with 7-Zip or WinRAR and open the files in a PDF or boardview viewer.
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.