Boardview for the MSI K9N Ultra desktop motherboard, MSI board number MS-7250, version 2.2, in a 3.85 MB CAD file. MS-xxxx is MSI's own internal numbering, and the version is printed on the PCB near the slots. CAD boardview files can be opened with programs like Boardviewer, FlexBV or CAD-capable viewers, giving part placement and net lists for tracing rails, checking the CPU VRM and finding test points. Make sure the version on the board matches V2.2, since other revisions may have a different layout.
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.