MSI MS-7524 motherboard package, a ZIP of about 2.87 MB whose name gives only the model code. The revision and the file types inside are unknown until you extract it, and the size could fit a schematic set or a boardview with supporting files. Technicians use such material to follow the power sequence, find the source of a shorted rail and locate filter capacitors or MOSFETs around the CPU socket. MSI labels its boards with the MS-7xxx code and a revision on the PCB, so compare that marking with the contents.
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.