MSI desktop BIOS for the MS-7680 board, version 2.0, sold as the H61M-P33, with a B3 marking in the name that likely refers to the chipset stepping. The image is stored in a RAR archive of roughly 2.9 MB. MSI uses the MS-xxxx code printed on the PCB to identify its mainboards, so check that code and the version next to it before flashing. A dump like this is typically written to the SPI chip with a programmer to revive a board that no longer posts; keep a backup of the original contents first.
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 →