Windows Help file (.hlp)

def is_hlp(file_path: str) -> bool:
    """Check if file is a valid HLP by magic bytes."""
    signature = bytes([0x3F, 0x5F])
    with open(file_path, "rb") as f:
        return f.read(2) == signature

function isHLP(buffer: Buffer): boolean {
  const signature = Buffer.from([0x3F, 0x5F]);
  return buffer.subarray(0, 2).equals(signature);
}

func IsHLP(data []byte) bool {
    signature := []byte{0x3F, 0x5F}
    if len(data) < 2 {
        return false
    }
    return bytes.Equal(data[:2], signature)
}