1. Click on the Start Menu, key in regedit and hit Enter.
2. Navigate through HKEY_LOCAL_MACHINE, SOFTWARE, Microsoft, Windows, CurrentVersion, explorer, ShellIconOverlayIdentifiers and Offline Files.
3. Set the value of Default from {4E77131D-3629-431c-9818-C5679DC83E81} to "" (nothing).
4. Restart.