MSI MS-7B79 motherboard boardview for revision 1.0, compressed into a 1.17 MB ZIP archive. After extracting, open the layout in a boardview program such as OpenBoardView or FlexBV, depending on the file format inside. It maps component placement, net names and pin connections, which speeds up locating test points, tracing a rail back to its regulator and finding a shorted part. MSI produced several revisions of this board, so check that the silkscreen reads rev 1.0 before trusting the 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 @cidschematicandboardviewofficial. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.