Small RAR archive, 556 KB, for the MSI MS-8979 at revision 00. The name does not reveal the document type inside. Revision 00 usually marks an initial release, so compare it with the marking on your PCB before trusting component locations. Once extracted, schematic or boardview files let you trace supply rails, find the source of a short and identify parts by their reference designators. Use WinRAR or 7-Zip to unpack it, then a PDF reader or a boardview viewer depending on the contents.
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.