Zip archive of 6.20 MB for the ASUS FX504GE gaming laptop, with the number 312 most likely marking the BIOS version, following the usual ASUS model-dot-version naming. Such packages typically hold a firmware image for updating through EZ Flash or for writing to the SPI chip with a programmer when the laptop will not boot. Before programming, dump and save the original chip, which also preserves serial and system data. Make sure the image size matches the flash chip capacity and the board fits the FX504GE.
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 @opendatasheet. Enginerys does not host this file.
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Compressed archive that every operating system opens without extra software.