ZIP archive of about 1.84 MB associated with the MSI MS-7536 motherboard. Apart from the board number the name reveals nothing, neither revision nor contents, so treat it as an unverified package until you have looked through the files. A desktop board pack like this typically supplies schematics, a layout file for a boardview viewer or a BIOS image. MSI's MS-7xxx code appears on the PCB with a revision, and the two should agree with the documents before you rely on test point positions or rail names when diagnosing a dead 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 .zip file
Compressed archive that every operating system opens without extra software.