title: How do I modify a file while maintaining its CRC-32 checksum?
body: <p>An old game I'm trying to mod has a CRC-32 check. I don't have access to the CRC checksum itself, so I must modify the file while maintaining the same checksum output. </p>
  
  <p>Info I have</p>
  
  <ul>
  <li><p>The file, if the file itself is the only input to the CRC-32 program, I can calculate what the CRC-32 checksum should be.</p></li>
  <li><p>The 32-bit polynomial code. </p></li>
  </ul>