Boardview for the HP laptop mainboard DAX8MMB18D0, Quanta project X8M, revision D, packed in a small zip archive. The DA-prefixed number follows the Quanta numbering pattern, where X8M is the project code and the trailing D0 reflects the board revision. A boardview lets you locate components, test points and nets on the PCB, trace power rails and find the source of a short. Open it in a viewer such as OpenBoardView, FlexBV or BoardViewer, and make sure the number silkscreened on your board matches before trusting the pinouts.
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.