MSI MS-7139 archive in RAR format, 6.54 MB, its size suggesting more than one document. The name does not list the contents, so a schematic set, boardview or BIOS files could be inside. A separate boardview for revision 10 of this board also exists. Open it with 7-Zip or WinRAR. Compare the MS-7xxx number and revision printed on the motherboard with the files before relying on them, and always back up the original firmware before reflashing.
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 @IT_SERVICE_WORLD. 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.
7-ZipWinRARThe Unarchiver (macOS)