title: Empty Mime Type
body: <p>I'm trying to load .zip file (with type validation) - and its mime type is empty string. it's strange because it is reproducible only in chrome and only on few computers (!!!)</p>
  
  <p>(I suppose it is chrome bug <a href="http://code.google.com/p/chromium/issues/detail?can=2&amp;start=0&amp;num=100&amp;q=&amp;colspec=ID%20Pri%20Mstone%20ReleaseBlock%20OS%20Area%20Feature%20Status%20Owner%20Summary&amp;groupby=&amp;sort=&amp;id=133803" rel="nofollow noreferrer">http://code.google.com/p/chromium/issues/detail?can=2&amp;start=0&amp;num=100&amp;q=&amp;colspec=ID%20Pri%20Mstone%20ReleaseBlock%20OS%20Area%20Feature%20Status%20Owner%20Summary&amp;groupby=&amp;sort=&amp;id=133803</a>)</p>
  
  <p>it is not too good solution - to inspect file name if file.type is empty - so maybe smbdy can provide a betters solution</p>
  
  <p>I've managed to find <a href="https://stackoverflow.com/questions/856013/mime-type-for-zip-file-in-google-chrome/14138225#14138225">Mime type for zip file in Google Chrome</a> but it does not fit - I do not use Symphony</p>