MSI MS-7428 materials archived as a 3.21 MB RAR file. The board number is the only detail in the name, so open the archive to see whether it has schematics, boardview data or BIOS files. MS-7xxx is MSI's internal designation scheme, and one code may cover several revisions. Compare the revision printed on the PCB with the documents. Technicians use such files to trace rails, check power sequencing and recover a corrupt BIOS with an external programmer after backing up the original.
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.