Boardview for the MSI MS-7B61 desktop motherboard at revision 1.0, archived as a 1.29 MB RAR. The MS-7Bxx code is MSI's internal mainboard designation and is printed on the PCB itself, so matching it is straightforward. Technicians load such a file in OpenBoardView, FlexBV or comparable software to search parts by designator, highlight every pin of a net and find test points for rails such as VCORE, memory or standby power. Confirm the revision marking reads 1.0 to ensure the layout corresponds to your board.
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 @BoardSchematic. 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.