Developer Studio File Workspace Options subheader (.opt)

def is_opt(file_path: str) -> bool:
    """Check if file is a valid OPT by magic bytes."""
    signature = bytes([0xCF, 0xFA, 0xED, 0xFE])
    with open(file_path, "rb") as f:
        return f.read(4) == signature

function isOPT(buffer: Buffer): boolean {
  const signature = Buffer.from([0xCF, 0xFA, 0xED, 0xFE]);
  return buffer.subarray(0, 4).equals(signature);
}

func IsOPT(data []byte) bool {
    signature := []byte{0xCF, 0xFA, 0xED, 0xFE}
    if len(data) < 4 {
        return false
    }
    return bytes.Equal(data[:4], signature)
}