Revision 2.1 layout of the MSI MS-7B79 desktop mainboard, supplied as a boardview inside a 1.29 MB RAR archive. With it you can locate parts by reference designator, follow a signal from the chipset to a connector and see which pins share a net when measuring diode mode or resistance to ground. Extract the archive and load the file in a viewer like OpenBoardView or FlexBV. Check that the revision printed on the PCB reads 2.1, because neighbouring revisions of the same MS-7B79 can differ in component placement.
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 @BoardSchematic. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.