Zip package for MSI MS-6575, 4.28 MB. The file name carries only the brand and board code, with no revision or indication of contents. An archive of this size may hold schematics for tracing rails and signals, BIOS images for recovery or both, so inspect it after extraction. MSI marks its PCBs with the MS- number, normally near the slots or a board edge. Match it and the revision to your board, and keep a dump of the original firmware before any reflash.
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.
Built-in OS tools7-Zip