Boardview for a Lenovo laptop board numbered NM-C871, an LCFC design, packed as a zip archive. The file name reads NMC781R02, apparently a typo for the same board, with R02 likely marking revision 0.2 and 1017 possibly a date code. Boardview software such as OpenBoardView, FlexBV or Boardviewer shows part placement, net names and test points. Use it to find components and probe rails during a short or no-power diagnosis. Confirm the NM number silkscreened on the PCB before trusting it.
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 @laptexdna. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.