BDV boardview for the Acer Aspire E1-421 laptop, with the board identified as ZQZ in the name. It lets a technician locate components, connectors and test points and follow nets across both sides of the motherboard while searching for shorts, missing rails or damaged parts. BDV files open in viewers such as Boardviewer or FlexBV. ZQZ resembles a Quanta project code, but rely on the number printed on the PCB itself and confirm it matches before trusting the layout.
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 @boardviews. Enginerys does not host this file.
How to open a .bdv file
Text-based boardview produced by Honhan / Hon Hai test tooling, with lightly obfuscated content.