RAR archive for the MSI MS-7750 motherboard, revision 1.0, about 1.19 MB. The file name gives no indication of the contents, so unpack it to check whether a schematic, boardview or both are included. MS-7750 follows the MS-7xxx numbering MSI applies to its desktop mainboards. Verify that the board under repair shows rev 1.0, then use the documentation to follow voltage rails from the input connector through the VRM, check power-good signals and identify components behind a no-power or no-display condition.
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.