Repair package for the MSI MS-7149, supplied as a 7.03 MB RAR archive. Beyond the board number, the file name says nothing about what is inside, so open it with 7-Zip or WinRAR to see whether it holds schematics, boardview data or firmware. MS-7xxx numbers are MSI's own designations for its desktop mainboards, so check the number and revision printed on the PCB before you rely on it. A schematic helps trace power rails and find shorts. Dump and keep the original BIOS before flashing any image 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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.