Comment 1 for bug 1228254

I'm leaning to the following implementation:

If the local-path is provided and we are not a confined application:
  2) Throw a DBus exception (e.g. the moral equivalent of EEXIST)
if not confined:
 3) Append a .1 to the file name. (although I'm appending a uuid to make sure we do not have an extra loop)