A 4.81 MB RAR archive for the MSI MS-7420 board. No revision, version or document type appears in the name, so the contents need checking after extraction with WinRAR or 7-Zip. MSI assigns MS-7xxx numbers to boards it designs itself, mostly desktop motherboards. A schematic lets you follow the CPU VRM, memory power and standby circuits when hunting a fault. For firmware, match the image size to the flash chip and keep a dump of the original before reprogramming.
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.
7-ZipWinRARThe Unarchiver (macOS)