Archive tied to the MSI MS-V388 PCB, revision 2.1, with a size of 2.97 MB. The name does not say what is inside, and since a separate boardview for the same revision exists, this one may contain schematics or a combined set; open it to confirm. MS-V codes are MSI designations usually applied to graphics cards. Such documents help trace power stages and signal routes during repair. Check that revision 2.1 matches the marking on your board before using any 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.