Board package for the MSI MS-7133, distributed as a 1.74 MB RAR archive. Its name gives only the MSI board number, so the document type and revision must be determined by opening it. Technicians use such material to trace power circuits, locate components and restore damaged BIOS chips with an SPI programmer. The MS-7xxx code is MSI's internal motherboard numbering. Match it and the printed revision to your board, and back up the existing flash before writing anything.
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.