Small archive, about 631 KB, identified only by the code MS-9621 and no brand, model or revision. Because the name is uninformative, the contents must be checked after extracting the RAR, as it may contain a schematic, a boardview or other documentation. MS-prefixed numbers like this are typical of MSI board codes, but the exact product is not stated. Make sure the PCB carries the same code before relying on any values. Use such files for tracing rails, locating parts and diagnosing shorts.
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 .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.