RAR archive of 134 KB tied to the ASUS BU201LA, marked 2.0, which probably refers to the board revision; the exact contents are not stated in the name. A file this compact typically contains a boardview or similar board data used to find parts and trace nets during diagnosis. Unpack it to see the actual format and pick a suitable viewer. Check that the PCB is revision 2.0 before trusting component locations, because an earlier revision may differ.
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)