Boardview for MSI motherboard MS-7519, revision 2.1, supplied as a CAD file. This layout data shows where every component sits on both sides of the PCB and how pins are connected by nets, which makes it practical for locating test points, following a rail to its source or finding which parts share a shorted line. CAD boardview files are opened with boardview software such as OpenBoardView or similar viewers. Check that the board is revision 2.1, as layouts can shift between revisions of the same MS number.
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 @boardview. Enginerys does not host this file.
How to open a .cad file
GenCAD text export, the usual format for Compal, Quanta, Wistron and Dell / HP / Lenovo laptop boards.