BIOS for the ASUS Z170-E desktop motherboard, version 3801 according to the name, packed in a 13.9 MB RAR archive. Z170 boards use Intel's Skylake-era desktop chipset. The archive may contain an official update file in CAP format or a raw image, so check what it holds before deciding how to apply it. For programmer use, a raw dump must match the SPI chip capacity, and the original contents should be read and stored first, since they carry the board serial and MAC address.
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 @biosarchive. 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.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →