BIOS package for the Biostar TA790GXB3, marked 6.x, which most likely refers to the board revision series; listed under ECS. Desktop images of this kind are written to the board's flash chip to revive a board that fails to POST after a bad update or corruption. Open the RAR with any archive tool and confirm the revision printed on the PCB falls within 6.x. Verify the image size against the chip, and dump the original contents before programming with an external programmer.
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 →