Boardview archive of 424 KB, labelled only LA5891 with the BDV tag, which points to a Compal LA-5891 series motherboard; the name gives no revision or laptop model. A boardview lets you search a net or reference designator and see exactly where it sits on the board, handy when tracing a rail from a schematic. Compal uses this LA-number pattern on boards sold under many brands. Confirm that the full board number and revision on the PCB match, then open the file in a compatible viewer such as OpenBoardView.
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.