Boardview for Lenovo motherboard NM-E531, revision 1.0, in TVW format inside a 2.88 MB ZIP archive. NM-numbered boards are LCFC designs, the Lenovo-owned ODM. The .tvw format is the Teboview layout file and generally needs TVW-capable software, since free viewers like OpenBoardView do not open it. With it you can locate components, look up nets, find test points and measure suspected shorts quickly. Make sure the PCB carries NM-E531 with a matching revision, as layout changes between revisions can move parts.
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 .zip file
Compressed archive that every operating system opens without extra software.