Lenovo boardview archive named for NM-C371 revision 0.3, 1.30 MB zipped, indexed alongside the NM-C372 Y540 board family. NM numbering belongs to LCFC, Lenovo's design house. The boardview lets you locate components, pins and test points and follow nets across the PCB, usually in OpenBoardView or FlexBV after extraction. Because the file name and the indexed board differ, compare the number and revision printed on your motherboard before trusting component positions.
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 @cynetitsolution. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Built-in OS tools7-Zip