Archive for the MS-V388 board, revision 8.0, size 1.84 MB. MS- codes are MSI's internal PCB numbers, and V-series numbers are typically used for MSI graphics cards. The name does not list the contents, so it may hold a boardview, schematic or related files; open it to check. Material like this helps a technician locate VRM components, memory power and test points on a card. Revisions differ in layout, so the r8.0 marking on your PCB should match before you rely on any part reference.
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.