RAR archive labelled MS-96C4, around 631 KB, with no brand, revision or contents given in the name. The MS- prefix matches MSI board numbering, and MS-9xxx codes are generally used by MSI for server, industrial and embedded boards, though the name itself does not confirm the product. Extract with 7-Zip or WinRAR and inspect the contents, likely schematic material. Such files let you trace power rails and signals and locate parts during repair. Compare the code printed on the PCB against the documents before using them.
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.