Compressed material for the Quanta BD5 board, revision 1A, as a 1.46 MB RAR archive. The name gives neither the laptop model nor the full DA-prefixed board number, so verify the BD5 code directly on the PCB. Content is probably a circuit schematic, possibly with boardview data, the usual references for diagnosing no-power, no-display and charging faults. Follow power sequencing through the regulators and locate test points, after confirming that the 1A revision matches the board in hand.
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 @IT_SERVICE_WORLD. 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.