title: Remove execute permission on file downloaded on a Mac
body: <p>We have a web app running on a Windows server, which allows a user to do some processing and download the results. The result is a set of files which are dynamically created on the server and zipped into a single file for facilitating the download process. </p>
  
  <p>Everything works fine on Windows, but when users download the file from the web app on a Mac, the contents of the zip file have the execute (chmod +x) permission set (I presume that the same happens on *NIX and Linux machines). This can, of course, be removed by running the 'chmod -x' command, but is there a way by which one can remove the execute permission on the files, so that when downloaded on a Mac, the files don't have the execute permission set by default?</p>