title: zip deflated 0% ? Why no compression?
body: <p>I'm trying to zip the content of a folder that contains 4 big files, very, very similar. So I expect the size to be reduced.</p>
  
  <p>Here's the command I'm using on linux/fedora:</p>
  
  <pre><code>zip -9 myarchive.zip -r myfolder -P mypassword
  </code></pre>
  
  <p>I get the response:</p>
  
  <pre><code>adding: myfolder/ (stored 0%)
  adding: myfolder/Program1.exe (deflated 0%)
  adding: myfolder/Program2.exe (deflated 0%)
  adding: myfolder/Program3.exe (deflated 0%)
  adding: myfolder/Program4.exe (deflated 0%)
  </code></pre>
  
  <p>Then I get the archive, which is approx the same size as my original folder.</p>
  
  <p>It seems that no compression is occurring at all. Why?</p>