An 11.2 MB zip package for the MSI MS-7231 board. The file name lists nothing beyond the model number, so treat the contents as unknown until unpacked; at this size it may combine schematics, boardview data or firmware. MSI uses the MS-7xxx pattern for desktop motherboards, and the code plus a revision number is printed on the PCB. Match both before using the material to trace power rails or check shorts, and dump the existing BIOS flash with a programmer before overwriting it with any file from the archive.
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 .zip file
Compressed archive that every operating system opens without extra software.