A small boardview archive of 305 KB whose name only states LA5892 and BDV, the usual shorthand for boardview; it most likely corresponds to Compal board LA-5892P, although no revision is given. Boardview data shows the placement of parts, nets and test points, which speeds up probing for missing voltages or shorts. Compal's LA numbering identifies the ODM board rather than the laptop brand. Extract the file and open it in OpenBoardView or a similar program, then check the revision silkscreened on the PCB before relying on it.
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.