MSI MS-6558 files packaged as a 1.12 MB zip archive. Beyond the brand and project number, the name gives no information about revision, chipset or contents. MSI marks its boards with this MS code, making a match easy to confirm on the bench. Such packages help when tracing signals and power rails, identifying component values, or restoring corrupted firmware through an SPI or parallel flash programmer. Read and keep a copy of the original chip before writing, and confirm that the PCB revision matches.
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.