A 1.50 MB ZIP archive labelled only with the MSI board number MS-7542, with no revision, version or content type given. The size would fit a BIOS image together with a flashing tool, a boardview, or a short schematic set, so unpack it and identify each file. MS-7xxx is MSI's internal model numbering for its own motherboards. If firmware turns up, confirm that the SPI or LPC flash on the board matches it, and dump the original chip with a programmer as a backup first. Check the PCB marking against the documents.
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.