BIOS image for the ASUS GL503GE, with 312 most likely marking the firmware version. The 16.0 MB size matches a 128 Mbit SPI flash chip, the common capacity on Intel laptops of this class. Technicians write such dumps with a programmer like CH341A or RT809 when a board will not POST because of corrupted firmware. Read and keep the original chip contents first, since they hold serial and MAC data, and check that the chip on your board is also 16 MB 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 @LaptopsBoardview. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →