Small RAR archive of about 797 KB labelled MSI 7769-10, which most likely refers to MSI board MS-7769 with a revision marked 10, read as 1.0. The name gives no model name or content type, so open it to see whether it holds a schematic or a boardview. MSI desktop boards use four-digit MS-7xxx codes printed on the PCB, and the code and revision there should match before you use the data. Typical repair uses include tracing power rails, checking the VRM and locating parts around a short.
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.