Archive for the MSI MS-7623 motherboard, 549 KB in RAR format. The name gives no revision, so open it and check whether the documents specify one, then compare with the REV marking on your PCB. A revision 1.0 boardview for this board is listed separately and can be used alongside it. Contents are probably schematic material, the usual pairing for MSI board codes, useful for checking rails, following signals and identifying components during repair.
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.
7-ZipWinRARThe Unarchiver (macOS)