docs: def SetPeSubsystem(fd, console=True):
    """Takes file like obj and returns (offset, value) for the PE subsystem."""
    current_pos = fd.tell()
    fd.seek(0x3c)  # _IMAGE_DOS_HEADER.e_lfanew
    header_offset = struct.unpack("<I", fd.read(4))[0]
    # _IMAGE_NT_HEADERS.OptionalHeader.Subsystem ( 0x18 + 0x44)
    subsystem_offset = header_offset + 0x5c
    fd.seek(subsystem_offset)
    if console:
      fd.write(b"\x03")
    else:
      fd.write(b"\x02")
    fd.seek(current_pos)