Runtime Error 339 is caused when an .OCX file (generally the dunzip32.ocx) file is missing from a software application that you are trying to install on your computer. The 339 error won’t necessarily appear during the installation of the application, but may occur when you try and use the program for the first time – when your PC realizes that it cannot use the .ocx file it requires. To fix this, you should look to repair the damaged / missing file at the root of the problem.



