RAR archive of 575 KB for the MSI MS-6507 board, with 00b in the name likely indicating a revision or document version. MS-65xx numbers belong to MSI older desktop motherboard range, so this is probably a schematic for a socketed desktop board rather than a laptop. Such diagrams help trace VRM phases, standby power, clock and reset signals when a board will not post. Confirm the PCB revision silkscreen matches, since component placement and values could change between revisions of the same MSI design.
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 @generalschematics. 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.