MSI MS-6552 package in zip format, 1.64 MB. The file name carries only the brand and MSI's internal board code, so its contents and revision remain unspecified until unpacked. The MS number is silkscreened on MSI boards, which lets you confirm compatibility quickly. Typical uses are diagnosing missing voltages, checking shorts around regulators, or reprogramming a corrupted BIOS chip. Save a backup of the original firmware before flashing, and verify that any image matches the flash chip capacity.
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.