Boardview for the N61B-MB-E mainboard, with BDV indicating boardview format, in a compact 317 KB RAR. Boardview data shows component placement, part references and net connections, so you can locate test points, trace a signal from the schematic to the physical pad and probe for shorts quickly. Files of this kind open in viewers such as OpenBoardView, FlexBV or Boardviewer depending on the internal format. Verify the board name printed on your PCB matches before trusting locations.
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.