Here are my imports:
import com.codename1.ui.*; import com.codename1.ui.util.*; import com.codename1.ui.plaf.*; import com.codename1.ui.events.*; import com.code
It looks like Codename One has omitted that class - and others, I suspect.
Judging by the documentation, I suspect you want to use the com.codename1.io.FileSystemStorage class and its openInputStream method.
You may well want to watch the video on storing data to persistent storage too.