Boardview for the X63C mainboard, board name X63C-MB-C, packed as a 379 KB RAR; BDV in the name marks it as board-layout data. After extracting, open the file with a boardview tool such as OpenBoardView, FlexBV or a similar viewer. These tools show component outlines, net names and pin connections, which is useful for locating test points or tracing a shorted rail across the board. Compare the board name and revision printed on the PCB with the file before trusting placements.
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 @cyberlanelectonik. 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.