MSI MS-6504 at revision 0B, an early version of this MSI desktop board, stored as a 568 KB RAR file. The name gives no document type, but a schematic set is the usual content of MSI archives this size. Use it to identify the components on each rail, measure expected voltages and work out the power-on sequence when the board does not start. Because 0B comes before the later 10A, 20A and 100 versions, check that your board is really a 0B unit before relying on part numbers.
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.