Archive of 9.13 MB whose name suggests an output BIOS image marked as working, with 1BKL2J3 in brackets, which looks like a Dell service tag although the name does not confirm the model. No board number or chip size is stated, so check the contents after extraction. Such dumps are flashed to the SPI chip with a programmer like CH341A or RT809H; read and save the original chip before writing, and ensure the image size equals the flash capacity.
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 @Satale_bios_esquemas_Laptop. 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)