ZIP package of about 2.35 MB for the MSI MS-7530 motherboard. No revision, version or content list appears in the name, so the files need checking after extraction before you use them on a repair. Material for MSI desktop boards usually covers schematics for tracing VRM, memory and standby supplies, boardview layouts for finding parts and test pads, or BIOS images for reflashing. The MS-7xxx code is MSI's own model numbering and sits on the PCB with a revision number, which should match what you find in the archive.
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.