Service files for the MSI MS-7029, delivered as a 1.57 MB RAR archive. Apart from the board number, the name gives no revision, date or file type, so treat the contents as unverified until you open them. Such archives commonly contain a circuit diagram for checking power rails and signal paths, or firmware for rewriting the BIOS chip in a programmer. MS-7xxx is MSI's internal board code. Verify the number and revision on the PCB, and only flash an image whose size matches the chip fitted on the board.
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.