Compressed RAR archive of 152 KB labelled for the ASUS N53TA platform, revision 2.0 according to its name. The name does not say whether it holds a schematic, a boardview or firmware, but the small size suggests documentation or a boardview rather than a full flash image. Open it with WinRAR or 7-Zip and inspect the contents before use. Compare the revision silkscreened on the mainboard with 2.0, because component placement and rail naming can change between board revisions of the same model.
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.