Boardview for MSI motherboard MS-16K4, revision 1.0, supplied as a rar containing a .cad layout file. MS-numbered boards are MSI in-house designs, with the number printed on the PCB that should match before trusting the data. Boardview files show component placement, part references and net connections on both sides, helping a technician locate test points, follow power rails and find a shorted capacitor. The .cad format opens in viewers such as OpenBoardView, FlexBV or Boardviewer. Check that revision 1.0 matches the board under repair.
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 @Boardviewno. 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.