Boardview for the Lenovo IdeaPad S145-15API, machine type 81UT, built on the NM-C511 motherboard. The NM- prefix follows the LCFC numbering used for Lenovo consumer boards, so check that NM-C511 is printed on your PCB before trusting part positions. The RAR archive needs unpacking first, after which a viewer such as OpenBoardView, FlexBV or Boardviewer can open the layout. Use it to find components, test points and connectors, follow nets between parts and narrow down a shorted rail without tracing copper by hand.
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 @fixtronix. 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.