Compressed RAR package, 2.03 MB, for the MSI MS-7004 board, described by nothing more than its number. The revision and content type are unknown from the name, so verify them after extraction. Typical contents are a schematic for measuring power sequencing and signal lines, or a BIOS image to write to the firmware chip when the board will not POST. MSI applies the MS-7xxx pattern to its own motherboards. Check that the PCB's number and revision match, and dump the existing BIOS before programming a replacement.
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.