RAR archive of about 583 KB for the Lenovo IdeaPad U350. The name does not state whether it contains a schematic, boardview or firmware, and gives no board number or revision. Extract it with WinRAR or 7-Zip to see the contents. If it is a diagram or boardview, match the board code against the PCB before tracing rails or locating components. If it is a BIOS image, back up the original SPI chip with a programmer first and confirm that the image size fits the flash chip.
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 @cyberlanelectonik. 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.