Boardview for board 14060, revision SA, packed into a small RAR of about 189 KB; BDV in the name stands for boardview. The number matches the Wistron project used in the Acer Aspire Z1-611 all-in-one, though the file name itself states no model. Boardview files open in viewers such as OpenBoardView, FlexBV or Boardviewer and show part placement, net names and pin connections, which speeds up locating components, test points and shorted lines. Check that the PCB revision matches before probing.
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.