BIOS firmware archive for the Biostar B360GT5S desktop motherboard, version 5.0 as stated in the name, indexed here under the ECS brand. The B360 in the model points to an Intel B360 chipset board. Inside the RAR you should find a dump or update image for the board's SPI flash. Technicians use such files to recover a board that fails to POST after a corrupted update by writing the image with a CH341A or similar programmer. Confirm the board model and version on the PCB, and read and save the original chip contents before writing anything.
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 →