title: zip files won't open in Mac OS
body: <p>Here, I am using PHP ZipArchive to give website users to combine a pdf file and some folders into a zip file, and then download them. It works perfectly on the Windows, linux computer I'm running it on. But if I download the files using my Mac the files will not unzip, double clicking creates a cpgz file. </p>
  
  <p>Can you please how can I resolve this issue on MAC?</p>