MSI MS-6583 package, a small zip of 560 KB. The file name holds nothing beyond brand and model code, so its contents are unconfirmed; the size is typical of a single BIOS image with a flash tool. Such files serve to restore corrupted firmware, either through a vendor utility or by writing the flash chip on an external programmer. MSI uses MS- codes for its own boards, printed on the PCB. Match the code and revision, and keep a dump of the original chip first.
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