MSI MS-7046 motherboard package, 1.69 MB, stored as RAR. The name tells nothing beyond the board code, leaving revision and contents to be checked after extraction with 7-Zip or WinRAR. MSI uses the MS-7xxx series for its desktop mainboards, printed on the PCB near the slots. A schematic would let a technician follow VRM rails, check power-on sequencing and find shorted components; a BIOS image would be written with a programmer once the original chip has been read and saved.
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.