Large 138 MB ZIP archive for a Dell laptop motherboard numbered DAGM6CMB8D0, revision D. Numbers starting with DA and ending in a revision code follow the Quanta scheme, meaning Quanta manufactured the board for Dell. The name does not list the contents, but a package of this size likely bundles schematics, boardview or firmware; inspect it with 7-Zip or WinRAR. Before using any part of it, check that the board number and revision D printed on your PCB match, as Quanta revisions can differ in layout and components.
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 @azvoltagemap. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.