MSI MS-7878 boardview at revision 1.1, in .cad format, roughly 3.7 MB. MS-7xxx numbers are MSI's own desktop motherboard identifiers, printed on the PCB, so the code and revision there should match before you work from this file. The name gives no retail model or chipset. A boardview like this shows component placement and nets, letting you trace rails, locate MOSFETs, capacitors and the BIOS chip, and find probing points during short or no-boot diagnosis. Open it with FlexBV, Boardviewer or similar software.
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.