Archive covering MSI MS-7511 board version 1.1, 1.03 MB as a RAR. The name states only the board and version, so the exact contents are unknown, though a service schematic is the most likely. MSI identifies desktop boards by MS-xxxx numbers with a version suffix that changes when the design is revised. Match it to the silkscreen before trusting circuits, then use it to trace rails, find test points and work through power-on faults.
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.
7-ZipWinRARThe Unarchiver (macOS)