BIOS archive labeled only as X79 version 3.5E, with no board maker or model given, so the exact target motherboard is unknown. The roughly 3.5 MB RAR likely contains a firmware image for an Intel X79 board, but compare its contents and chip size against your board before using it. Write it to the SPI flash with a hardware programmer only after dumping and saving the original. An image meant for a different board or flash size will not boot correctly.
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 →