Boardview for the MSI B350 TOMAHAWK, an AM4 motherboard with board number MS-7A34 at revision 1.0, provided as a 5.2 MB CAD file. MSI prints this MS-number and revision on the PCB, and they should match before trusting the layout. Technicians use it to identify components by reference, follow nets between the VRM, chipset and slots, locate test points and find the source of a short on a rail. The CAD format can be loaded in common boardview programs such as FlexBV, letting you search nets and flip between top and bottom sides.
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 @boardviews. 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.