Compressed archive, 2.00 MB, labelled for the MSI MS-7103 motherboard. The name does not describe its contents or revision, so expect to unpack it with 7-Zip or WinRAR to see what is inside. Schematics in such packages help trace power rails and signals, boardviews locate parts and test points, and BIOS files are written to the SPI flash with a programmer. MS-7xxx numbers belong to MSI desktop boards; match the revision on the PCB before trusting values, and verify any image size against the flash chip capacity.
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.