title: Uniquely identify file on Windows
body: <p>I need to uniquely identify a file on Windows so I can always have a reference for that file even if it's moved or renamed. I did some research and found the question <a href="https://stackoverflow.com/questions/1866454/unique-file-identifier-in-windows">Unique file identifier in windows</a> with a way that uses the method GetFileInformationByHandle with C++, but apparently that only works for NTFS partitions, but not for the FAT ones.</p>
  
  <p>I need to program a behavior like the one on DropBox: if you close it on your computer, rename a file and open it again it detects that change and syncs correctly. I wonder whats the technique and maybe how DropBox does if you guys know.</p>
  
  <p>FileSystemWatcher for example would work, but If the program using it is closed, no changes can be detected.</p>
  
  <p>I will be using C#.</p>
  
  <p>Thanks,</p>