Archive of 2.08 MB for the MSI MS-V388 board at revision 1.1. Its contents are not described by the name, so extract it to see whether it holds schematics, a boardview or other repair data; a dedicated r1.1 boardview is also catalogued separately. MSI uses MS-V numbers for graphics card PCBs. Technicians use this kind of material to follow power rails and identify failed components. Revision must match the silkscreen on the board for part positions and values to be reliable.
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 @schematicslaptop. 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.