BIOS for a board labelled XP-S260M, given as a 4MB image inside a RAR archive; the name does not identify the brand or chipset. A 4MB file corresponds to a 32 Mbit SPI flash chip, so check the chip marking before programming with a tool like CH341A. Technicians typically use such dumps to recover a board after a failed update or corrupted firmware. Because details are sparse, compare the board marking carefully and read and keep the original chip contents before writing.
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 →