You would need to use FileMaker to convert the file first. You can also use the standalone database converter.
If your file is larger than 400MB or has more than 4 tables FM recommends using the standalone converter:
I realized my question was not clear.
no matter how i made the conversion of FM11 to 12; The result it's the same, it's only a questione of speed...
What I mean was that using the "save schedules and groups" from FMS11 and then "import schedules and groups" in 12 all schedules remains without the correct refences to the files beause of the chance of the extensions.