RAR file of 1.85 MB for the MSI MS-7051 board, the base model rather than the G variant archived separately. No revision or content detail appears in the name. MS-7xxx is the pattern MSI uses for desktop mainboards of its own design. Open the archive to see whether it holds a schematic for tracing rails and signals or a BIOS image for reprogramming. Check the code and revision on the PCB, and confirm any image matches the flash chip capacity before writing it with a programmer.
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.