Service material for the MSI MS-7400 board, stored in a 2.49 MB RAR archive. The name gives no revision, chipset or list of contents. The package may hold a schematic, a boardview or a BIOS dump, which opens in WinRAR or 7-Zip and then in a PDF reader, a boardview viewer or a programmer tool. MS-7xxx is MSI's own desktop numbering. Check the PCB marking and revision against the files before using them to diagnose shorts or to rewrite the SPI flash.
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)