RAR package of 2.50 MB for the MSI MS-7140 motherboard. No revision, chipset or document type is given in the name, so inspect the contents after extraction. Such archives typically contain schematics for diagnosing power-on faults and shorts, or BIOS dumps that can be restored with a programmer such as a CH341A. The MS-7140 code follows MSI's in-house numbering for desktop boards. Read the PCB marking and revision first, then save the existing BIOS before writing any 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.