Boardview package for a Dell mainboard identified only by the number 18718-1, in a zip archive of about 39.2 MB. Five-digit numbers with a dash suffix follow the Wistron scheme, the ODM that produces many Dell boards. The name gives no model or revision beyond this. A boardview maps component locations and nets, helping locate test points, trace power rails and isolate shorts on the actual PCB. Open the contents with a viewer such as OpenBoardView or FlexBV and confirm the number on your board matches.
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 @laptexlaptopbios. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.