Boardview for the Compal motherboard LA-K455P, where BV stands for boardview. The 724 KB RAR holds a layout file showing part placement, net names and test points, opened in programs such as OpenBoardView or FlexBV. The name does not state the laptop brand or the revision. Compal uses LA-xxxxP numbers for boards it builds for various brands, so read the number and revision from the PCB silkscreen and confirm the match before using it to find shorts or measure rails.
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 @bartonarquivos. 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.