title: moveItemAtPath works on iPad, but not on Simulator?
body: <p>I am using moveItemAtPath call to change a file extension from .PDF to .pdf (just lowercasing it). It fails on the simulator as shown below, but works fine on the device.  Could it be some sort of permissions problem?</p>
  
  <pre><code>lowerPDF=[upperPDF stringByReplacingOccurrencesOfString:@".PDF" withString:@".pdf"];
  NSLog(@"Lowercasing filename %@ to %@",upperPDF,lowerPDF);
  if (![fm moveItemAtPath:upperPDF toPath:lowerPDF error:&amp;error]) 
      NSLog(@"RENAME error %@",[error localizedDescription]);
  
  NextPage[13625:207] Lowercasing filename /Users/scott/Library/Application Support/iPhone Simulator/4.2/Applications/7D38A00A-3990-441C-96C5-DD56EC3B6922/Documents/What a Difference a Day made 24010812.PDF to /Users/scott/Library/Application Support/iPhone Simulator/4.2/Applications/7D38A00A-3990-441C-96C5-DD56EC3B6922/Documents/What a Difference a Day made 24010812.pdf
  NextPage[13625:207] RENAME error The operation couldn’t be completed. (Cocoa error 512.)
  </code></pre>
  
  <p>Thanks,</p>
  
  <p>//Scott</p>