RAR package for MSI board MS-7429, about 1.18 MB. The name carries no revision, chipset or file-type details, so extract it to find out what it holds. MSI labels its own motherboard designs with MS-7xxx codes, usually printed near the expansion slots. A schematic from such a package helps locate fuses, regulators and test points when diagnosing a dead board. Any firmware image should be checked against the SPI chip size, and the current chip contents saved before writing.
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.