MSI board MS-7392 at revision 1.2, supplied as a RAR archive of about 1.12 MB. The name gives no retail model and does not list the contents, so expect a schematic or boardview and confirm after extraction. MSI desktop motherboards use four-digit MS-7xxx codes printed on the PCB, often near the expansion slots, and both the code and revision 1.2 should match the board on the bench. Use the files to trace CPU and memory power rails, check standby circuits and locate shorted parts.
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.