Archive for MSI board MS-9899, revision 1.0, about 1.16 MB in RAR form; the product name is not stated. MSI uses MS-9xxx numbering largely for server, workstation and industrial boards, so check the code printed on the PCB. The archive is likely a schematic used to trace standby and main power rails, follow power-good chains and find the parts linked to a dead circuit. Make sure the revision on the board reads 1.0 before taking component values from the drawings.
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.