Archive of 4.10 MB for the HP EliteBook 840 G2 laptop; the name gives only the model, without a board number or description of the contents. It may contain a schematic, boardview or BIOS image, so check each file once extracted. HP business laptops of this generation were built by ODMs, so confirm the board number on the PCB matches. If firmware is included, back up the original SPI chip and confirm the image size before writing 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 @biositechyangiyer. 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.
7-ZipWinRARThe Unarchiver (macOS)