RAR archive holding an ASUS BIOS image called outimage. The generic name gives no model, board number or version, so identify the target before using it. The name suggests output from a BIOS editing or extraction tool, though that cannot be confirmed from the name alone. Unpack it and check that the image size matches the SPI flash chip on your board. Back up the original chip with a programmer before writing, and avoid flashing it to an unidentified board.
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 @skclappybios. 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 →