const fs = require('fs');

const fileData = fs.readFileSync('downloaded_test.hwpx');
const hex = fileData.subarray(0, 16).toString('hex').toUpperCase();
console.log('Hex signature of first 16 bytes:');
console.log(hex.match(/.{1,2}/g).join(' '));

if (hex.startsWith('D0CF11E0A1B11AE1')) {
    console.log('File type: OLE Compound File (standard HWP binary)');
} else if (hex.startsWith('504B0304')) {
    console.log('File type: ZIP file (standard HWPX)');
} else {
    console.log('File type: Unknown');
}