title: Strange filenames with embedded slashes - Mac/Windows conflict
body: <p>I wrote some code this week to generate zip files, and tried to use it on both Windows and Mac machines. Mac works fine (it was written with Mac in mind) but Windows less so. The resulting zip files, when opened on my Mac, contains a single level of files that look like this:</p>
  
  <p><img src="https://i.stack.imgur.com/FjtW3.png" alt="Filenames, as viewed through a Mac."></p>
  
  <p>Rather than the expected nested filesystem of flash_out/assets, etc. I'm not hugely concerned about how to fix the code that generated these, but I am rather bothered about fixing these particular files so I can compile them on my mac. As it stands, I can't use these.</p>
  
  <p>The strange thing is that opening up this zip on a Windows machine does indeed interpret this as a series of nested folders with files in. But zipping that file system up and sending it back to the Mac, the problem persists. I've not seen anything quite like this before.</p>