BIOS for the Intel DX58SO desktop motherboard, compressed into a 1.85 MB RAR. The name carries no version information, so check the release on the chip if it can still be read. The X58 in the model points to the Intel X58 chipset platform for LGA1366 processors. A dump like this is typically programmed onto the SPI flash with an external programmer when the board fails to post. Always save the original first and confirm the image size matches the capacity of the installed chip before writing it.
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 →