Archive in RAR format, 572 KB, for revision 0B of the MSI MS-6507 motherboard. Only the brand, model code and revision appear in the name, with no indication whether it holds a schematic or BIOS data. Early revision codes like 0A and 0B usually denote pre-production or initial releases, and the circuitry can differ from later 1.0 or 5.0 boards. Check the revision on the PCB carefully before relying on part locations, and save the original firmware before any reflash.
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.